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21 tháng 8 2019

Ta có : Công suất tỏa nhiệt của bóng đèn là :

P=1500(W)=\(\frac{Q}{t}\)

\(\Rightarrow Q=t.P=5400.1500=8100000J=8100KJ\)

(Đổi 1,5h=5400s)

BẠN TỰ DỊCH ĐC KO

21 tháng 8 2019

chọn ý d nhé

21 tháng 12 2021

1.How many eggs do you need to make a cake?

2.How much rice is left in the rice cooker ?

E3: Each sentence has 1 mistake.Circle the mistake1. There are about 500 species of poisonous snakes, 200 of them are harmful to man.A B C D2. The electric cooker who is wrapped in the box is made of steel.A B C D 3. The legal age which a person is considered to be an adult is customarily 18.A B C D4. The gardener used the scissors which he had bought them from a village shop to cut the flowers. A B C D5. The area with the greatest number of thunderstorms each year is the interior of the...
Đọc tiếp

E3: Each sentence has 1 mistake.Circle the mistake

1. There are about 500 species of poisonous snakes, 200 of them are harmful to man.

A B C D

2. The electric cooker who is wrapped in the box is made of steel.

A B C D

 

3. The legal age which a person is considered to be an adult is customarily 18.

A B C D

4. The gardener used the scissors which he had bought them from a village shop to cut the flowers. A B C D

5. The area with the greatest number of thunderstorms each year is the interior of the Florida

A B C

peninsula, which the Atlantic and Gulf airstreams meet.

D

6. Aloha is a Hawaiian word meaning ‘love’, that can be used to say hello or goodbye.

A B C D

7. People whose exercise frequently have greater physical endurance than those who doesn't.

A B C D

8. I have always wanted to visit Paris, that is the capital of France.

A B C D

9. Shakespeare, who works are famous all over the world, was an English writer.

A B C D

10.The water temperature in a spring depends on that of the soil through where the water flows.

A B C D

E4.Make the best choice

1. This is the place_________ I met my wife.

A. what B. where C. which D. that

2. Simon is the man _________ Mary loves.

A. who B. which C. whom D. A&C

3. My wife, _________ is a doctor, works at Community Hospital.

A. who B. which C. whom D. that

4. Only one of the people _________ work in the company is qualified.

A. what B. which C. who D. where

5. She is the one _________ I told you about.

A. what B. which C. whose D. who

6. Those _________ had studied hard passed their exams.

A. what B. which C. who D. whose

7. The magazine _________ you lent me is interesting.

A. what B. which C. whom D. whose

8. The man _________ is resting is very tired.

A. what B. which C. whom D. who

9. The boy _________ sat next to you is my friend.

A. who B. which C. whom D. whose

10.We are using books _________ were printed last year.

A. what B. who C. which D. whose

11.The painting_________Ms. Wallace bought was very expensive.

A. whom B. whose C. which D. where

12.The homeless people_____story appeared in the paper last week have now found a place to live.

A. who B. whom C. that D. whose

13.__________ is your favourite sport, swimming or running.

A. What B. Which C. Whom D. Whose

14.Were the Wright brothers the ones __________built the first aeroplane?

A. which B. whom C. whose D. that

15.I don't like stories________ have unhappy endings.

A. where B. which C. they D. who

16.The periodic table contains all the elements, ________ has a particular atomic weight and atomic number.

A. which of each B. each of which C. which each D. each

17.Ansel Adams was a landscape photographer ________ photographs of the western United States show nature on a grand scale.

A. whose B. of whom C. of his D. his

18.Jan didn't check she had enough petrol before she left, ________ was careless of her.

A. what B. it C. that D. which

19.This is a town ________ many people live.

A. in which B. which C. at which D. on which

20.She, ________ is your sister, lives far away.

A. which B. who C. whom D. she

21.I see some girls ________ are pretty.

A. whom B. which C. who D. they

22.Give back the money ________ you took.

A. itB. who C. whom D. which

23.He was killed by a man ________ friends we know.

A. whose B. which C. whom D. that

24.He spoke to the messengers with ________ you were leaving.

A. which B. whom C. whose D. that

25.We captured a town ________ is in Spain.

A. whom B. where C. which D. it

26.The farmers ________ we saw were in the field.

A. whose B. which C. they D. whom

27.The women ________ I gave the money were glad.

A. to whom B. to that C. for whom D. for that

28.I know a boy ________ name is John.

A. who B. whose C. whom D. that

29.The man ________ you sent to the general has reported the victory.

A. whose B. which C. whom D. he

30.I saw those slaves ________ had been led to the city.

A. whose B. which C. whom D. who

2
1 tháng 6 2021

E3: Each sentence has 1 mistake.Circle the mistake

1. There are about 500 species of poisonous snakes, 200 of them are harmful to man.

2. The electric cooker who is wrapped in the box is made of steel.

3. The legal age which a person is considered to be an adult is customarily 18.

4. The gardener used the scissors which he had bought them from a village shop to cut the flowers.

5. The area with the greatest number of thunderstorms each year is the interior of the Florida peninsula, which the Atlantic and Gulf airstreams meet.

6. Aloha is a Hawaiian word meaning ‘love’, that can be used to say hello or goodbye.

7. People whose exercise frequently have greater physical endurance than those who doesn't.

8. I have always wanted to visit Paris, that is the capital of France.

9. Shakespeare, who works are famous all over the world, was an English writer.

10.The water temperature in a spring depends on that of the soil through where the water flows.

 

1 tháng 6 2021

1. This is the place_________ I met my wife.

A. what B. where C. which D. that

2. Simon is the man _________ Mary loves.

A. who B. which C. whom D. A&C

3. My wife, _________ is a doctor, works at Community Hospital.

A. who B. which C. whom D. that

4. Only one of the people _________ work in the company is qualified.

A. what B. which C. who D. where

5. She is the one _________ I told you about.

A. what B. which C. whose D. who

6. Those _________ had studied hard passed their exams.

A. what B. which C. who D. whose

7. The magazine _________ you lent me is interesting.

A. what B. which C. whom D. whose

8. The man _________ is resting is very tired.

A. what B. which C. whom D. who

9. The boy _________ sat next to you is my friend.

A. who B. which C. whom D. whose

10.We are using books _________ were printed last year.

A. what B. who C. which D. whose

11.The painting_________Ms. Wallace bought was very expensive.

A. whom B. whose C. which D. where

12.The homeless people_____story appeared in the paper last week have now found a place to live.

A. who B. whom C. that D. whose

13.__________ is your favourite sport, swimming or running.

A. What B. Which C. Whom D. Whose

14.Were the Wright brothers the ones __________built the first aeroplane?

A. which B. whom C. whose D. that

15.I don't like stories________ have unhappy endings.

A. where B. which C. they D. who

16.The periodic table contains all the elements, ________ has a particular atomic weight and atomic number.

A. which of each B. each of which C. which each D. each

17.Ansel Adams was a landscape photographer ________ photographs of the western United States show nature on a grand scale.

A. whose B. of whom C. of his D. his

18.Jan didn't check she had enough petrol before she left, ________ was careless of her.

A. what B. it C. that D. which

19.This is a town ________ many people live.

A. in which B. which C. at which D. on which

20.She, ________ is your sister, lives far away.

A. which B. who C. whom D. she

21.I see some girls ________ are pretty.

A. whom B. which C. who D. they

22.Give back the money ________ you took.

A. itB. who C. whom D. which

23.He was killed by a man ________ friends we know.

A. whose B. which C. whom D. that

24.He spoke to the messengers with ________ you were leaving.

A. which B. whom C. whose D. that

25.We captured a town ________ is in Spain.

A. whom B. where C. which D. it

26.The farmers ________ we saw were in the field.

A. whose B. which C. they . D.whom

27.The women ________ I gave the money were glad.

A. to whom B. to that C. for whom D. for that

28.I know a boy ________ name is John.

A. who B. whose C. whom D. that

29.The man ________ you sent to the general has reported the victory.

A. whose B. which C. whom D. he

30.I saw those slaves ________ had been led to the city.

A. whose B. which C. whom . D.who

29 tháng 11 2019

is/electric/much/left/rice/the/how/cooker/in?

Trả lời: How much rice is left in the electric cooker?

12 tháng 7 2021

B . cooker

25 tháng 5 2022

What an electric cooker can do to help us ?

25 tháng 5 2022

What can an electric cooker help us to do?

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 42.Today we take electricity for granted and perhaps we do not realize just how useful this discovery has been. Steam was the first invention that replaced wind power. It was used to drive engines and was passed through pipes and radiators to warm rooms. Petrol mixed with air was the next invention that provided power. Exploded in a cylinder, it...
Đọc tiếp

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 42.

Today we take electricity for granted and perhaps we do not realize just how useful this discovery has been. Steam was the first invention that replaced wind power. It was used to drive engines and was passed through pipes and radiators to warm rooms. Petrol mixed with air was the next invention that provided power. Exploded in a cylinder, it drove a motor engine. Beyond these simple and direct uses, those forms have not much adaptability.

On the other hand, we make use of electricity in thousands of ways. From the powerful voltages that drive our electric trains to the tiny current needed to work a simple calculator, and from the huge electric magnet in steel works that can lift 10 tons to the tiny electric magnet in a doorbell, all are powered by electricity. An electric current can be made with equal ease to heat a huge mass of molten metal in a furnace, or to boil a jug for a cup of coffee.

Other than atomic energy, which has not as yet been harnessed to the full, electricity is the greatest power in the world. It is flexible, and so adaptable for any task for which it is wanted. It travels so easily and with incredible speed along wires or conductors that it can be supplied instantly over vast distances.

To generate electricity, huge turbines or generators must be turned. In Australia they use coal or water to drive this machinery. When dams are built, falling water is used to drive the turbines without polluting the atmosphere with smoke from coal.

Atomic power is used in several countries but there is always the fear of an accident. A tragedy once occurred at Chernobyl, in Ukraine, at an atomic power plant used to make electricity. The reactor leaked, which caused many deaths through radiation.

Now scientists are examining new ways of creating electricity without harmful effects to the environment. They may harness the tides as they flow in and out of bays. Most importantly, they hope to trap sunlight more efficiently. We do use solar heaters for swimming pools but as yet improvement in the capacity of the solar cells to create more current is necessary. When this happens, electric cars will be viable and the world will rid itself of the toxic gases given off by trucks and cars that burn fossil fuels

Which of the following power sources causes pollution by emitting harmful gases? 

A. Sunlight 

B. Petrol 

C. Water 

D. Wind 

1
15 tháng 11 2019

Chọn B

Kiến thức: Đọc hiểu

Giải thích:

Nguồn năng lượng nào sau đây gây ô nhiễm bằng cách thải khí độc hại?

  A. Ánh sáng mặt trời                                 

B. Xăng dầu               

C. Nước                      

D. Gió

Thông tin: When this happens, electric cars will be viable and the world will rid itself of the toxic gases given off by trucks and cars that burn fossil fuels.

Tạm dịch: Khi điều đó xảy ra, ô tô điện sẽ khả thi và thế thời sẽ có thể loại bỏ lượng khí độc hại từ khói xe tải, ô tô đang tiêu tốn hết những nguồn nhiêu liệu hóa thạch

 

1.     There are about 500 species of poisonous snakes, 200 of them are harmful to man.            A                              B                                                     C                              D 2.     The electric cooker who is wrapped in the box is made of steel.                A                     B             C                                      D 3.     The legal age which a person is considered to be an adult is customarily 18.        ...
Đọc tiếp

1.     There are about 500 species of poisonous snakes, 200 of them are harmful to man.

           A                              B                                                     C                              D

2.     The electric cooker who is wrapped in the box is made of steel.

               A                     B             C                                      D

3.     The legal age which a person is considered to be an adult is customarily 18.

                             A                                B               C                             D

4.     The gardener used the scissors which he had bought them from a village  shop to cut the flowers.

                  A                                      B                               C                                                   D

5.     The area with the greatest number of thunderstorms each year is the interior of the Florida

                                      A          B                                                   C                                   

peninsula, which the Atlantic and Gulf airstreams meet.

                     D

6.     Aloha is a Hawaiian word meaning ‘love’, that can be used to say hello or goodbye.

                A                                   B                   C                          D

7.     People whose exercise frequently have greater physical endurance than those who doesn't.

                          A                                 B                     C                                                     D

8.     I have always wanted to visit Paris, that is the capital of France.

          A                                  B              C                          D

9.     Shakespeare, who works are famous all over the world, was an English writer.

     A                                     B                       C                        D

10. The water temperature in a spring depends on that of the soil through where the water flows.

                                                A                             B                                      C                       D

 

2
20 tháng 7 2023

1.     There are about 500 species of poisonous snakes, 200 of them->which are harmful to man.

2.     The electric cooker who->which is wrapped in the box is made of steel.

3.     The legal age which->at which a person is considered to be an adult is customarily 18.

4.     The gardener used the scissors which he had bought them-> from a village  shop to cut the flowers.

5.     The area with the greatest number of thunderstorms each year is the interior of the Florida peninsula, where the Atlantic and Gulf airstreams meet.

Tham khảo: C5 đúng rồi mà ạ?

6.     Aloha is a Hawaiian word meaning ‘love’, that->which can be used to say hello or goodbye.

7.     People whose->who exercise frequently have greater physical endurance than those who doesn't->don't.

8.     I have always wanted to visit Paris, that->which is the capital of France.

9.     Shakespeare, who->whose works are famous all over the world, was an English writer.

10. The water temperature in a spring depends on that of the soil through where->which the water flows.

20 tháng 7 2023

1.     There are about 500 species of poisonous snakes, 200 of them->which are harmful to man.

2.     The electric cooker who->which is wrapped in the box is made of steel.

3.     The legal age which->at which a person is considered to be an adult is customarily 18.

4.     The gardener used the scissors which he had bought them-> from a village  shop to cut the flowers.

5.     The area with the greatest number of thunderstorms each year is the interior of the Florida peninsula, where the Atlantic and Gulf airstreams meet.

Tham khảo: C5 đúng rồi mà ạ?

6.     Aloha is a Hawaiian word meaning ‘love’, that->which can be used to say hello or goodbye.

7.     People whose->who exercise frequently have greater physical endurance than those who doesn't->don't.

8.     I have always wanted to visit Paris, that->which is the capital of France.

9.     Shakespeare, who->whose works are famous all over the world, was an English writer.

10. The water temperature in a spring depends on that of the soil through where->which the water flows.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 42.Today we take electricity for granted and perhaps we do not realize just how useful this discovery has been. Steam was the first invention that replaced wind power. It was used to drive engines and was passed through pipes and radiators to warm rooms. Petrol mixed with air was the next invention that provided power. Exploded in a cylinder, it...
Đọc tiếp

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 42.

Today we take electricity for granted and perhaps we do not realize just how useful this discovery has been. Steam was the first invention that replaced wind power. It was used to drive engines and was passed through pipes and radiators to warm rooms. Petrol mixed with air was the next invention that provided power. Exploded in a cylinder, it drove a motor engine. Beyond these simple and direct uses, those forms have not much adaptability.

On the other hand, we make use of electricity in thousands of ways. From the powerful voltages that drive our electric trains to the tiny current needed to work a simple calculator, and from the huge electric magnet in steel works that can lift 10 tons to the tiny electric magnet in a doorbell, all are powered by electricity. An electric current can be made with equal ease to heat a huge mass of molten metal in a furnace, or to boil a jug for a cup of coffee.

Other than atomic energy, which has not as yet been harnessed to the full, electricity is the greatest power in the world. It is flexible, and so adaptable for any task for which it is wanted. It travels so easily and with incredible speed along wires or conductors that it can be supplied instantly over vast distances.

To generate electricity, huge turbines or generators must be turned. In Australia they use coal or water to drive this machinery. When dams are built, falling water is used to drive the turbines without polluting the atmosphere with smoke from coal.

Atomic power is used in several countries but there is always the fear of an accident. A tragedy once occurred at Chernobyl, in Ukraine, at an atomic power plant used to make electricity. The reactor leaked, which caused many deaths through radiation.

Now scientists are examining new ways of creating electricity without harmful effects to the environment. They may harness the tides as they flow in and out of bays. Most importantly, they hope to trap sunlight more efficiently. We do use solar heaters for swimming pools but as yet improvement in the capacity of the solar cells to create more current is necessary. When this happens, electric cars will be viable and the world will rid itself of the toxic gases given off by trucks and cars that burn fossil fuels

The best title for this passage could be ____________. 

A. “Types of Power Plants” 

B. “Electricity: Harmful Effects on Our Life”

C. “How to Produce Electricity” 

D. “Why Electricity Is So Remarkable” 

1
15 tháng 11 2017

Chọn D

Kiến thức: Đọc hiểu

Giải thích:

Tiêu đề phù hợp nhất cho bài đọc là _______.

  A. “Các loại nhà máy điện”                       

B. “Điện: Tác hại đến cuộc sống của chúng ta”

  C. “Cách sản xuất điện”                                                              

D. “Tại sao điện lại quan trọng đến vậy”

Để tìm tiêu đề chính của bài đọc nên tìm hiểu các ý chính của từng đoạn:

Đoạn 1: Lịch sử các năng lượng được sử dụng qua cái thời kỳ

Đoạn 2: Các cách để sử dụng điện và hiệu quả của nó

Đoạn 3: Ngoài điện nguyên tử, điện được coi là một nguồn năng lượng linh hoạt

Đoạn 4: Cách để tạo ra điện và một ví dụ ở nước Úc

Đoạn 5: Rủi ro của điện hạt nhân

Đoạn 6: Cách tạo ra nguồn năng lượng điện mới mà không gây hại đến môi trường

Dịch bài đọc:

Ngày nay chúng ta xem điện là hiển nhiên và có lẽ chúng ta không nhận ra khám phá này hữu ích như thế nào. Hơi nước là phát minh đầu tiên dùng thay thế cho năng lượng gió. Nó được sử dụng để điều khiển động cơ và được dẫn qua các đường ống và lò sưởi để sưởi ấm các căn phòng. Xăng trộn với không khí là phát minh tiếp theo để cung cấp năng lượng. Hỗn hợp này nổ trong một xi lanh và làm động cơ hoạt động. Ngoài các cách sử dụng đơn giản và trực tiếp này, các dạng năng lượng kể trên không có nhiều khả năng thích ứng.

Mặt khác, chúng ta tận dụng điện bằng hàng ngàn cách khác nhau. Từ việc dùng điện áp mạnh để điều khiển những đoàn tàu điện hiện đại đến dòng điện nhỏ chỉ để vận hành một chiếc máy tính đơn giản, và từ dòng điện từ trường lớn trong các nhà máy thép có thể nâng đến 10 tấn tới dòng từ trường trong một chiếc chuông cửa, tất cả đều là năng lượng điện. Một dòng điện có thể dễ dàng làm nóng chảy một khối lượng kim loại lớn trong lò luyện hay chỉ đơn giản đun sôi lượng nước cho một tách cà phê.

Nếu không kể đến điện nguyên tử - cái mà vẫn chưa được khai thác triệt để, điện là nguồn năng lượng lớn nhất trên thế giới. Nó linh hoạt, và có khả năng đáp ứng cho bất cứ nhiệm vụ nào. Nó truyền đi dễ dàng và với tốc độ đáng kinh ngạc trong dây kim loại hoặc dây dẫn, vì vậy người ta có thể truyền tải điện ngay tức khắc trên phạm vi lớn.

Để tạo ra điện, phải làm quay những tua-bin lớn hoặc máy phát điện. Ở Úc, người ta sử dụng than hoặc nước để vận hành loại máy móc này. Khi các con đập được xây dựng, nước đổ xuống làm quay các tua-bin và không làm ô nhiễm môi trường như khói than.

Năng lượng hạt nhân được dùng ở một vài quốc gia nhưng vẫn còn tồn tại nỗi lo sợ về rủi ro. Một bi kịch đã từng xảy ra ở Chernobyl, Ukraine, tại một nhà máy điện hạt nhân được dùng để sản xuất điện. Lò phản ứng bị rò rỉ và gây ra nhiều trường hợp tử vong do nhiễm phóng xạ.

Ngày nay, các nhà khoa học đang nghiên cứu các cách tạo ra điện mới mà không tác động xấu đến môi trường. Họ sử dụng thủy triều khi chúng chảy vào và rút đi ở các con vịnh. Quan trọng hơn cả, các nhà khoa học hy vọng việc sử dụng ánh sáng mặt trời sẽ hiệu quả hơn. Chúng ta sử dụng các lò sưởi năng lượng mặt trời cho các bể bơi nhưng cần cải thiện dung tích của những tấm pin mặt trời để tạo ra nhiều điện hơn. Khi điều đó xảy ra, ô tô điện sẽ khả thi và thế giới sẽ có thể loại bỏ lượng khí độc hại từ khói xe tải và ô tô vận hành bằng nhiêu liệu hóa thạch

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 42.Today we take electricity for granted and perhaps we do not realize just how useful this discovery has been. Steam was the first invention that replaced wind power. It was used to drive engines and was passed through pipes and radiators to warm rooms. Petrol mixed with air was the next invention that provided power. Exploded in a cylinder, it...
Đọc tiếp

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 42.

Today we take electricity for granted and perhaps we do not realize just how useful this discovery has been. Steam was the first invention that replaced wind power. It was used to drive engines and was passed through pipes and radiators to warm rooms. Petrol mixed with air was the next invention that provided power. Exploded in a cylinder, it drove a motor engine. Beyond these simple and direct uses, those forms have not much adaptability.

On the other hand, we make use of electricity in thousands of ways. From the powerful voltages that drive our electric trains to the tiny current needed to work a simple calculator, and from the huge electric magnet in steel works that can lift 10 tons to the tiny electric magnet in a doorbell, all are powered by electricity. An electric current can be made with equal ease to heat a huge mass of molten metal in a furnace, or to boil a jug for a cup of coffee.

Other than atomic energy, which has not as yet been harnessed to the full, electricity is the greatest power in the world. It is flexible, and so adaptable for any task for which it is wanted. It travels so easily and with incredible speed along wires or conductors that it can be supplied instantly over vast distances.

To generate electricity, huge turbines or generators must be turned. In Australia they use coal or water to drive this machinery. When dams are built, falling water is used to drive the turbines without polluting the atmosphere with smoke from coal.

Atomic power is used in several countries but there is always the fear of an accident. A tragedy once occurred at Chernobyl, in Ukraine, at an atomic power plant used to make electricity. The reactor leaked, which caused many deaths through radiation.

Now scientists are examining new ways of creating electricity without harmful effects to the environment. They may harness the tides as they flow in and out of bays. Most importantly, they hope to trap sunlight more efficiently. We do use solar heaters for swimming pools but as yet improvement in the capacity of the solar cells to create more current is necessary. When this happens, electric cars will be viable and the world will rid itself of the toxic gases given off by trucks and cars that burn fossil fuels

What does the author mean by saying that electricity is flexible? 

A. It is cheap and easy to use

B. It is used to drive motor engines

C. It can be adapted to various uses

D. It can be made with ease

1
7 tháng 10 2019

Chọn C

Kiến thức: Đọc hiểu

Giải thích:

Tác giả có ý gì khi nói rằng điện linh hoạt?

  A. Nó rẻ và dễ sử dụng.

  B. Nó được sử dụng để điều khiển động cơ.

  C. Nó có thể được điều chỉnh để sử dụng với các mục đích khác nhau.

  D. Nó có thể được thực hiện một cách dễ dàng.

Thông tin: On the other hand, we make use of electricity in thousands of ways. From the powerful voltages that drive our electric trains to the tiny current needed to work a simple calculator, and from the huge electric magnet in steel works that can lift 10 tons to the tiny electric magnet in a doorbell, all are powered by electricity. An electric current can be made with equal ease to heat a huge mass of molten metal in a furnace, or to boil a jug for a cup of coffee.

Tạm dịch: Mặt khác, chúng ta lại sử dụng điện bằng hàng ngàn cách khác nhau. Từ việc dùng điện áp mạnh để điều khiển những đoàn tàu điện hiện đại đến dòng điện nhỏ chỉ để làm một con tính đơn giản, và từ dòng điện từ trường lớn trong các nhà máy thép có thể nâng đến 10 tấn tới dòng từ trường trong một chiếc chuông cửa, tất cả đều là năng lượng điện. Một dòng điện có thể dễ dàng làm nóng chảy một khối lượng kim loại lớn trong lò luyện hay chỉ đơn giản đun sôi lượng nước cho một tách cafe