CAIE IGCSE Physics 4.5.6.8 Recall/use: P = I2R to explain why
Practise explaining high-voltage power transmission using P = I^2R, current size, cable resistance and thermal energy loss.
- Syllabus
- 2026–2028
- Course
- Physics 0625
Exam points
- link higher transmission voltage to lower current for the same transmitted power
- apply P = I^2R to explain reduced heating losses in long transmission cables
- explain why lower current can allow thinner wires while limiting wasted power
4.5.6.8—Recall/use: P = I2R to explain why question 1
Fig. 8.1 represents the system of transmission of electrical energy from a power station to a home that is a long distance away.
Fig. 8.1
Explain why a very high voltage is used for transmission over large distances.
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