Edexcel IGCSE Physics · Spec 2.13-2.16
Power & Energy: Using the Equations
Worked examples using the electrical power and energy equations.
Physics revision video
Power & Energy: Using the Equations
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Spec 2.13-2.16
What you need to know
- Use power equals I times V
- Use energy equals power times time
- Rearrange both equations
Active recall
Quick check
Answer each question before opening the answer.
What is the power of a device drawing 3 A at 230 V?
P = I × V = 3 × 230 = 690 W.
How much energy does a 2000 W kettle use in 60 s?
E = P × t = 2000 × 60 = 120 000 J (120 kJ).
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