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10.3 Electrical energy and power

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Question 16
F

A resistor has a resistance of 12 Ω.

The current in the resistor is 1.5 A.

a.

State the equation linking electrical power, current and resistance.

[1]
b.

Calculate the power transferred to the resistor.

[2]
c.

Calculate the energy transferred to the resistor in 5.0 minutes.

[3]
d.

The resistor is replaced by a 3.0 Ω resistor.

The current is changed so that the power transferred to the new resistor is the same as your answer to (b).

Calculate the new current.

[3]
Markscheme

10.3 Electrical energy and power Questions

  1. GCSE
  2. /Physics
  3. /10.3 Electrical energy and power

105 exam-style questions on Edexcel GCSE Physics 10.3 Electrical energy and power, covering 10.3.1 The heating effect of an electric current, 10.3.2 Reducing energy transfer in wires, 10.3.3 Advantages and disadvantages of the heating effect, 10.3.4 Energy transferred by an electrical circuit, 10.3.5 Electrical power, and 10.3.6 Energy transfers in domestic devices. Each one has a worked solution and a mark scheme showing where the marks go.

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