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1.2 Conservation and dissipation of energy

1.2 Conservation and dissipation of energy

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Question 25

A subsea tidal turbine array has a mean electrical power output of 34.5 MW34.5\text{ MW}34.5 MW, which is sufficient to power 15 00015\,00015000 deep-ocean exploration units.

a.

Calculate the mean power supplied to each exploration unit. Give your answer in watts.

[2]
b.

Some of the kinetic energy from the tidal flow is wasted as thermal energy due to friction in the rotating shafts and viscous drag on the turbine blades. Engineers apply a low-friction polymer coating to the rotating shafts and streamline the blade profiles.

Explain how these modifications affect the efficiency of the tidal turbines.

[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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