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4.3 Electric circuits

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Question 20

A circuit consists of an a.c. supply and two lamps connected in parallel. The electromotive force (e.m.f.) of the supply is 240 V240\text{ V}240 V. When connected to this supply, the resistance of one lamp is 600 Ω600\ \Omega600 Ω and the resistance of the other lamp is 400 Ω400\ \Omega400 Ω.

a.

Calculate the current in the 400 Ω400\ \Omega400 Ω lamp.

[2]
b.

Calculate the energy used by the 400 Ω400\ \Omega400 Ω lamp in 8.08.08.0 hours. Give your answer in kilowatt-hours (kWh\text{kWh}kWh).

[3]
c.

Calculate the combined resistance of the two lamps in this parallel circuit.

[3]
Markscheme

4.3 Electric circuits Questions

  1. IGCSE
  2. /Physics
  3. /4.3 Electric circuits

136 exam-style questions on CIE IGCSE Physics 4.3 Electric circuits, covering 4.3.1a Circuit diagrams and circuit components, 4.3.2a Series circuits, 4.3.2b Parallel circuits, 4.3.2c Current and potential difference in circuits, 4.3.2d Combined resistance of resistors in parallel, and 4.3.3 Action and use of circuit components. Each one has a worked solution and a mark scheme showing where the marks go.

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