Physics (AS & A Level) · May / June 2017 · Paper 22 · Question 7
9702
As printed in the paper
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7(a)[1]
7(b)(i)[3]
7(b)(ii)[6]
1. 1.50 = 0.180 × (6.00 + 0.200 + RX) RX = 2.1(3) Ω 2. p.d. AB = 1.5 − (0.180 × 0.200) or 0.18 × (2.13 + 6.00) = 1.46(4) V 3. efficiency = (useful) power output / (total) power input or IV / IE (= 1.46 / 1.5) = 0.97 [0.98 if full figures used]
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