O-LevelPhysicsEnergy & Work5054/21 · Oct/Nov 2021 · Q46 Marks

In a coal-fired power station, coal is burnt and electrical energy is produced.

(a)State the form of energy in the coal that is transferred to electrical energy.[1]
(b)(i)State the principle of the conservation of energy.[2]
(b)(ii)The quantity of electrical energy produced by the power station is much less than the quantity of energy in the coal that is burnt to generate the electricity. Explain why this is so.[2]
(c)State one environmental consequence of generating electricity in coal-fired power stations.[1]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2021). The mark or mark type is shown in brackets.

[B1] chemical (energy)
[B1] energy cannot be created and energy cannot be destroyed
[B1] energy can be transferred from one form into another
[B1] some chemical energy is transferred to thermal energy (sound and light)
[B1] thermal energy lost to air / water / buildings / equipment
[B1] any one from: carbon dioxide produced; carbon monoxide produced; global warming; greenhouse gases nitrous oxide produced; sulfur dioxide produced; acid rain; rise in sea-level

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