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4.2.5 Electrical energy and electrical power

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Question 19

Electrical power P P\,P is transmitted from a power station to a town at a high voltage V V\,V through cables of total resistance RRR.

Which expression correctly represents the rate of thermal energy loss (power loss) in the transmission cables?

A

Ploss=V2RP_{\text{loss}} = \frac{V^2}{R}Ploss​=RV2​

B

Ploss=P2RV2P_{\text{loss}} = \frac{P^2 R}{V^2}Ploss​=V2P2R​

C

Ploss=PRVP_{\text{loss}} = \frac{P R}{V}Ploss​=VPR​

D

Ploss=V2P2RP_{\text{loss}} = \frac{V^2}{P^2 R}Ploss​=P2RV2​

Markscheme

4.2.5 Electrical energy and electrical power Questions

  1. IGCSE
  2. /Physics
  3. /4.2.5 Electrical energy and electrical power

69 exam-style questions on CIE IGCSE Physics 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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