Charge, Current & Potential

Difference

Charge (Q) charge is measured in coulombs (C).

A single electron carries a charge of 1.6 x 10-19 C.

Current (I) - is measured in amperes (A).

Current is the rate of flow of charge. A current of 1 A means that 1 coulomb of charge flows

past a point in a circuit every second. ( 1 A = 1 C s-1 ) Current is measured in a circuit using an

ammeter which is placed in series with the component of interest in the circuit.

I = current in amperes, A

DQ = charge in coulombs, C

Dt = time in seconds, s

Potential difference (V) - is measured in volts (V).

Potential difference is the work done per unit charge. A potential difference of 1 V means that

1 joule of work is done per coulomb of charge. ( 1 V = 1 J C-1) Potential difference in a circuit is

measured using a voltmeter which is placed in parallel with the component of interest in the

circuit.

V = potential difference in volts, V

W = work done or energy transferred in joules, J

Q = charge in coulombs, C…read more

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