Define electric current. What is the SI unit of electric current. b) One coulomb of charge flows through any cross-section of a conductor in 1 second. What is the current flowing through the conductor? c) Which instrument is used to measure electric current? How should it be connected in a circuit? d) What is the conventional direction of the flow of electric current? How does it differ from the direction of flow of electrons? e) A flash of lightning carries 10C of charge which flows for 0.01s. What is the current? If the voltage is 10MV, what is the energy?

1. The flow of electric charges or electrons in a conductor such as a metal wire is known as electric Ampere is the SI unit of electric charges.

1. The current flowing through the conductor when one coulomb of charge flows through any cross-section of a conductor in 1 second is 1 ampere.

1. For the measurement of electric current, an ammeter is used which is connected in series in the

1. The direction of conventional direction of flow of electric current takes place from the positive terminal of a battery to the negative terminal across the outer circuit. It is different from the direction of flow of electrons because the electrons flow from the negative terminal to the positive terminal.
2. Given,

Charge moved, Q = 10C Time taken, t = 0.01s We know that,

Current, I = Q/t = 10/0.01 = 1000A

Potential difference = Work done/ charge moved

Work done = potential difference × charge moved = 10 × 106 × 10 = 100 × 106 = 100MJ Energy = work done = 100MJ