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1 g of coal on complete combustion liber...

`1 g` of coal on complete combustion liberates `18 k J` of heat. Calculate the amount of coal required to liberate the same amount of heat that an electric heater of `2 kW` provides in `1 h`.
or
Electricity generated by a windmill is another form of solar energy. Explain ?

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`2 kW xx 1h = 2 kW xx 3600 s = 7200 kJ = 7200 kJ(18 kJ//g) = 400 g`
or
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