O-LevelPhysicsEnergy & Work5054/22 · Oct/Nov 2017 · Q47 Marks

A 75W filament lamp in an office is accidentally left switched on for 63 hours when the office is closed.

(a)(i)Calculate the electrical energy that is supplied to this lamp in this time.[3]
(a)(ii)The efficiency of the lamp is 0.12 (12%). Calculate the energy released by the lamp in the form of light.[1]
(b)(i)The power station that generates the electricity supplied to the office uses oil as its fuel. State and explain whether oil is a renewable or a non-renewable source of energy.[1]
(b)(ii)Discuss one environmental consequence of using oil as a source of energy.[2]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2017). The mark or mark type is shown in brackets.

[C1] (E =) Pt or 75 × 63 or 75 × 63 × 60
[C1] 75 x 63 x 60 x 60 or 2.835 × 10⁵ or 0.075 × 63
[A1] 1.7 x 10⁷ J
[B1] 2.0 × 10⁶ J
[B1] non-renewable and gets used up/not replaced/will run out/finite
[B1] greenhouse gases/CO/CO₂ emitted
[B1] global warming/increase greenhouse effect/ice caps melt
or II
[B1] acid rain/NOx/SO₂ emitted
[B1] breathing difficulty/damage to buildings/acidity lakes or damages/kills plants/sea-life/animals/fish
or III
[B1] oil spills
[B1] damages/kills plants/sea-life/animals/fish

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