Edexcel IGCSE Physics 2.5 Electrical Energy Transfer Questions

Practise calculating electrical energy, current, voltage or time for lamps, batteries and other circuit components.

Exam points

convert time to seconds before substituting current, voltage and time into E=IVt
rearrange E=IVt to isolate current, voltage or operating time
convert kJ to J and round the final value to the requested precision

[Maximum number: 3]

The diagram shows a domestic lighting circuit.

Figure for Question Edexcel IGCSE Physics 2.5 Electrical Energy Transfer Questions question 1 — Edexcel IGCSE Physics

When switch 1 is closed, the current in lamp 1 is 22 mA .

Calculate the energy transferred by lamp 1 when it is on for 30 seconds.

energy transferred = ............ J

Marking points:
- substitution into $P=\frac{E}{t}$
- rearrangement
- evaluation

Example:
$5=\frac{E}{30}$ $E=5\times30$ $E=150\ \mathrm{J}$

Accept:
- ECF from 7(b)(ii)
- $E=230\times22\times10^{-3}\times30$
- 151.8, 152, or $153\ \mathrm{J}$
- use of E=VIt or other valid methods

Marking guidance:
- Deduct 1 mark for power-of-ten error.

All question bank results loaded

Edexcel IGCSE Physics 2.5 Electrical Energy Transfer Questions question 1