Units of Electric Current and Its Measurement

Q.

What do you mean by electric current? State the convention regarding the direction of electric current.

Q. Label the following diagram.

1. Battery
2. Connecting Wire
3. Electromagnet

Q.

Which of the following statements about an electromagnet is NOT true?

1. Insulated wire is wound around it.

2. It works only in the presence of electricity.

3. It is used in fans and radio.

4. It is a permanent magnet.

Q. Electromagnets are permanent magnets.

1. False
2. True

Q. Current of 1 ampere is equivalent to:

1. 1 coulomb of charge per second
2. 1 coulomb of charge per 10 second
3. 10 coulombs of charge per second
4. 1 coulomb of charge per hour

Q.

Which of the following represents the units of current and potential difference respectively?

1. V, A

2. A, C

3. A, V

4. V, J

Q. Which kind of bulb is more efficient in saving electrical energy?

1. CFL
2. LED
3. IEB
4. FTL

Q. Magnets align themselves according to the strongest magnet around them.

1. True
2. False