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3.2 Simple circuits

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Question 7
F

An electric heater is connected to the 230 V mains supply.

The power of the heater is 1.84 kW.

a.

Calculate the current in the heater.

[3]
b.

The heater is switched on for 2.5 hours.

Calculate the energy transferred by the heater in kW h\text{kW h}kW h.

[2]
c.

The cable connecting the heater to the mains has a resistance of 0.050 Ω.

Use the equation: power=(current)2×resistance\text{power} = (\text{current})^2 \times \text{resistance}power=(current)2×resistance

Calculate the power transferred in the cable.

[2]
d.

Explain why the cable should have a very low resistance.

[2]
Markscheme

3.2 Simple circuits Questions

  1. GCSE
  2. /Physics
  3. /3.2 Simple circuits

42 exam-style questions on OCR GCSE Physics 3.2 Simple circuits, covering 3.2.1 Series and parallel circuits, 3.2.2 Circuit symbols and circuit diagrams, 3.2.3 Current, potential difference and resistance, 3.2.4 Ohm's law, 3.2.5 Ohmic and non-ohmic resistors, 3.2.6 Designing circuits to investigate resistance, 3.2.7 Linear and non-linear circuit components, 3.2.8 Current-potential difference graphs for components, 3.2.9 Resistance in series and parallel, 3.2.10 Series and parallel circuit problems, 3.2.11 Circuits for measurement and testing, 3.2.12 Power transfer in circuit devices, and 3.2.13 Energy and power in resistor circuits. Each one has a worked solution and a mark scheme showing where the marks go.

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