Physics revision P1.1 + P1.2 energy and efficiency 0.0 / 5 ? PhysicsRadioactivityGCSEAQA Created by: melisaCreated on: 18-09-13 22:40 The useful energy transfer that happens in an electric lamp is: The correct answer is electricity → light. 1 of 5 'Wasted energy' becomes less useful because: It becomes increasingly spread out. 2 of 5 Which equation can be used to calculate the efficiency of an energy transfer? efficiency = useful energy out ÷ total energy in 3 of 5 In a certain device, 25% of the energy is usefully transferred. The energy efficiency of this device is: 25% 4 of 5 A coal-fired power station is 40% efficient. This means that: 40% of the chemical energy stored in coal is transferred to electrical energy. 5 of 5
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