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Current Electricity by Mind Map: Current Electricity
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Current Electricity

E.M.F.

work done by source in driving a unit charge round a complete circuit

E (e.m.f.) = W(work done)/Q(amount of charge)

1. Joules per coulomb (JC^-1) 2. Volts (V)

measured using voltmeter connected in series

Potential difference

amount of electrical energy converted to other forms of energy when one coulomb of positive charge passes between the two points.

V(potential difference) = W(electrical charge ---> other forms) / Q(amount of charge)

Volt (V)

measured using voltmeter connected in parallel

Resistance

S.I. Unit = Ohm

R = Volt (V) / Current flowing in it (I)

The longer the resistor, the higher the resistance

The bigger the cross-sectional area of the resistor, the lower the resistance

Types

Current

Formed by moving electrons

Measured in ampere(A)