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1.2 Conservation and dissipation of energy

1.2 Conservation and dissipation of energy

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Question 7

An electric winch on a marine research vessel is used to deploy a deep-sea scientific instrument.

a.

Write down the equation that relates electrical power (PPP), current (III), and potential difference (VVV).

[1]
b.

The electric winch motor operates at a potential difference of 240 V. When lifting the instrument, the electrical power supplied to the motor is 1.8 kW.

Calculate the current in the cable supplying the winch motor.

[2]
c.

State the equation that relates efficiency, total power input, and useful power output.

[1]
d.

During the lift, the winch motor itself receives a total electrical power input of 1500 W. The efficiency of this motor is 0.76.

Calculate the useful mechanical power output of the winch motor.

[2]
Markscheme

1.2 Conservation and dissipation of energy Questions

  1. GCSE
  2. /Physics
  3. /1.2 Conservation and dissipation of energy

26 exam-style questions on AQA GCSE Physics 1.2 Conservation and dissipation of energy, covering 1.2.1 Energy transfers in a system and 1.2.2 Efficiency. Each one has a worked solution and a mark scheme showing where the marks go.

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