Physics (AS & A Level) · Oct / Nov 2019 · Paper 11 · Question 5
The power P dissipated in a resistor of resistance R is calculated using the expression P = V^2 / R where V is the potential difference (p.d.) across the resistor. The percentage uncertainty in V is 5% and in R is 2%. What is the percentage uncertainty in P?
- A3%
- B7%
- C8%
- D12%
As printed in the paper
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Correct answer: D. 12%
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