(a)[2]
State what is meant by electromotive force.
(b)[1]
State the p.d. across the heater.
(c)[2]
Calculate the current through the heater.
(d)[2]
Determine the reading on the ammeter in Fig. 7.1. Explain your answer.
Physics 0625 · IGCSE · Electric circuits
Electric circuits — practice question
A washing machine contains an electric motor and an electric heater. Fig. 7.1 gives a simplified circuit diagram of the washing machine. The circuit has an a.c. supply, an ammeter marked A, a heater of resistance $25\,\Omega$, and a motor marked M. The power supply has an electromotive force (e.m.f.) of $230\,\text{V}$.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “e.m.f. is the electrical work done by a source in moving unit charge around a complete circuit” …
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