Q17 of 330 Page 11

What is an electric current? What makes an electric current flow in a wire?

The flow of electric charge is known as electric current. Electric current is carried by moving electrons through a conductor. It is the potential difference between the ends of the wire which make the electric charge (or current) to flow in the wire.


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16

Name a device which helps to maintain potential difference across a conductor (say, a bulb).

 16

If a potential difference of 10 V causes a current of 2 A to flow for 1 minute, how much energy is transferred?

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Define the unit of electric current (or Define ampere).

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What is an ammeter? How is it connected in a circuit? Draw a diagram to illustrate your answer.