February/March 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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20Energy Work Power EfficiencyMedium1 mark
Trains supply coal to a power station. The table shows quantities describing the operation of the power station.
symbolunit
power station average outputW
number of trains per day
mass of coal on a trainkg
energy from 1 kg of coalJ
number of seconds in one day
Which expression gives the efficiency of the power station?