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CAIE IGCSE Physics 4.2.5.2 Electrical Power: P = IV

Practise calculating electrical power, current or potential difference for lamps, heaters, resistors and supplies.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • substitute current and potential difference into P=IV to calculate power in watts
  • rearrange P=IV to find current or voltage while keeping A, V and W consistent
  • combine P=IV with V=IR when resistance data must be used first

4.2.5.2—Recall/use: for electrical power P = question 1

[Maximum number: 2]

Fig. 3.1 shows a model of a wind turbine used to demonstrate the use of wind energy to generate electricity. The wind is blowing towards the model, as shown.

Fig. 3.1

Fig. 3.1

The output current of the generator is 2.0 A . The output potential difference (p.d.) of the generator is 11 V .

Calculate the output power of the generator.

output power =
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