Exam-style question
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What is the formula for calculating electrical power in a circuit using potential difference and current?.
- A.P = V x I
- B.P = I / V
- C.P = V / I
- D.P = I^2 x R
Model answer
What a good answer should say
- P = V x I
Explanation
Why this works
The correct formula for electrical power is P = V x I, where P is power in watts, V is potential difference in volts, and I is current in amperes. This equation shows how power is directly proportional to both the voltage and the current in a circuit.
Common mistake
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