O-LevelPhysicsElectricity5054/22 · Oct/Nov 2015 · Q85 Marks
A spotlight in a television studio is at full brightness. The lamp inside the spotlight is powered by a 230 V supply and the current in the filament of the lamp is 27 A.
- (a)Calculate the power of the lamp. power =[2]
- (b)(i)The spotlight is kept switched on at full brightness. Calculate the energy transformed by the lamp in 30 minutes. energy =[1]
- (b)(ii)The cost of using one kilowatt-hour (kWh) of electricity is 23 cents. Calculate the cost of using the spotlight for 30 minutes. cost[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2015). The mark or mark type is shown in brackets.
- [1] (P = )VI or 230 × 27
- [1] 6200/6210W or 6.21/6.2kW
- [1] 1.1/1.12/1.1178 × 10⁷ J
- [1] 6.21 × 0.5 × 23 or 6.21 × 30 × 23 or 3.1/3.105 × 23
- [1] 71/71.3/71.4/71.415 c or $ 0.71/0.714/0.71415
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