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Powering Earth

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Question 7

Energy is transferred at high voltages in the national grid.

a.

Explain why radio waves may be generated by transmission lines.

[2]
b.

Explain why it is more efficient to transfer electrical energy at high voltages.

[3]
c.

A section of transmission line has a power loss of 11.25 kW11.25\text{ kW}11.25 kW and a resistance of 12.5 Ω12.5\ \Omega12.5 Ω.

Calculate the current in this transmission line.

[4]
Markscheme

Powering Earth Questions

  1. GCSE
  2. /Physics
  3. /Powering Earth

39 exam-style questions on OCR GCSE Physics Powering Earth. Each one has a worked solution and a mark scheme showing where the marks go.

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