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4.2 Electrical quantities

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Question 32
a.

Describe how a wind turbine generates electrical power from the wind.

[3]
b.

The electrical power output of a wind turbine is 900 kW900\text{ kW}900 kW. The output current is 720 A720\text{ A}720 A.

Calculate the output voltage of the wind turbine.

[3]
c.

For transmission, the output voltage is increased to 275 kV275\text{ kV}275 kV.

State two advantages of transmitting electrical power at high voltage.

[2]
Markscheme

4.2 Electrical quantities Questions

  1. IGCSE
  2. /Physics
  3. /4.2 Electrical quantities

452 exam-style questions on CIE IGCSE Physics 4.2 Electrical quantities, covering 4.2.1a Positive and negative charge, 4.2.1b Charging by friction and detecting charge, 4.2.1c Electrical conductors and insulators, 4.2.1d Electric fields and electric field patterns, 4.2.2a Electric current, charge and measuring current, 4.2.2b Conduction in metals and the direction of current, 4.2.2c Direct current and alternating current, 4.2.3a Electromotive force, 4.2.3b Potential difference and voltmeters, 4.2.4a Resistance, 4.2.4b Resistance of a metallic wire, 4.2.4c Current–voltage graphs, and 4.2.5 Electrical energy and electrical power. Each one has a worked solution and a mark scheme showing where the marks go.

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