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2024 · M/J · 5054/11 | Q13

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CIE-5054-2024-MJ-p11 · Question 13

Take the gravitational field strength as 9.8 N/kg (acceleration of free fall 9.8 m/s²), unless a question states otherwise.
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13 The input power to a lamp is 6.0W. The lamp wastes 2.7J of energy in 3.0s. What is the efficiency of the lamp? A 0.15 B 0.45 C 0.55 D 0.85

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5054/11/M/J/24Cambridge O Level Physics 5054 · May/June 2024 · Paper 1 variant 1 · Question 13