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4.5.6a Construction and operation of a transformer

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Question 73

An electricity distribution company needs to transmit electrical power from a wind farm to a distant city. Which type of current is typically used in the main transmission grid, and why is a high voltage preferred?

A

Alternating current; high voltage reduces transmission current, decreasing thermal energy losses (I2RI^2 RI2R) in the cables.

B

Alternating current; high voltage increases transmission current, allowing faster power delivery.

C

Direct current; high voltage lowers the resistance of the cables.

D

Direct current; low voltage minimizes power loss by reducing the current flowing through grid lines.

Markscheme

4.5.6a Construction and operation of a transformer Questions

  1. IGCSE
  2. /Physics
  3. /4.5.6a Construction and operation of a transformer

136 exam-style questions on CIE IGCSE Physics 4.5.6a Construction and operation of a transformer. Each one has a worked solution and a mark scheme showing where the marks go.

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