CAIE IGCSE Physics 4.2.3.6 E.m.f.: E = W/Q

Practise using E = W/Q for cells and batteries, linking e.m.f. to charge moved and energy transferred around a complete circuit.

Exam points

state E = W/Q as the defining equation for e.m.f. in a complete circuit
calculate work done or e.m.f. from energy and charge supplied by a battery
combine Q = It with E = W/Q when current and time are given

[Maximum number: 3]

(a)

State the equation which defines electromotive force (e.m.f.) E.

[ 1 ]

(b)

The e.m.f. of a battery is 9.0 V . The battery is in a circuit.

Calculate the work done by the battery when it moves a charge of 30 C around a complete circuit.

work done =

[ 2 ]

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4.2.3.6—E.m.f.: E = W/Q question 1

Question (a)

Question (b)