O-LevelPhysicsEnergy & Work5054/21 · Oct/Nov 2016 · Q38 Marks
A large power station burns oil to heat water in a boiler.
- (a)State the name of the form of energy stored in the oil before it is burnt.[1]
- (b)(i)State and explain whether oil is a renewable or a non-renewable energy source.[1]
- (b)(ii)Describe one environmental issue caused by burning oil to generate electricity in a power station.[1]
- (c)(i)State what is meant by efficiency.[1]
- (c)(ii) 1.the input power to the power station,[2]
- (c)(ii) 2.the energy wasted in 2.0 hours.[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2016). The mark or mark type is shown in brackets.
- [B1] chemical (potential energy)
- [B1] non-renewable and oil/it is not replaced/will run out
- [B1] acid rain or produces CO2 or warms lakes/rivers/sea or global warming or greenhouse effect
- [B1] useful energy output/(total) energy input or power for energy twice
- [C1] 1.9 × 10⁹/0.38 or 1.9 × 10⁹ × 100/38
- [A1] 5.0 × 10⁹ W
- [C1] (E = )Pt or 0.62 × 5.0 × 10⁹ × 2.0 (× 3600) or (5.0 – 1.9) × 10⁹ etc.
- [A1] 2.2 x 10¹³ J
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