A-LevelPhysicsWork, energy and power9702/12 · Oct/Nov 2019 · Q151 Mark
A power station using coal as fuel has an average power output of 3000 MW. Coal is supplied by 20 trains each day. The efficiency of the station in converting the thermal energy released from the coal to electrical energy is 26%. A mass of 1.0 kg of coal will release 33 MJ of thermal energy when burnt. Which mass of coal does each train bring?
A2.5 × 10⁴ kg
B6.3 × 10⁴ kg
C1.5 × 10⁵ kg
D3.0 × 10⁷ kg
✓ Correct answer
C: 1.5 × 10⁵ kg
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