Power, P · CSEC Physics

20 past-paper questions on Power, P, part of Mechanics, from every CSEC Physics paper on Quelpr.

1. 2(a)(i)2 marks· CSEC Physics · 1990 · Paper 2Give the formula for calculating the efficiency of the engine.
2. 2(a)(ii)2 marks· CSEC Physics · 1990 · Paper 2A car uses gasolene of energy content 40 MJ per litre. If its engine is 30% efficient, how much useful work does it do for every litre of gasolene consumed?
3. 1(a)(ii)3 marks· CSEC Physics · 1991 · Paper 2Assuming 1 month = 30 days, determine the average power consumption of the refrigerator in watts.
4. 2(a)(ii)2 marks· CSEC Physics · 1993 · Paper 2Explain what is meant by the term 'efficiency'.
5. 2(b)(ii)1 mark· CSEC Physics · 1993 · Paper 2In a power station, thermal energy is wasted at the rate of 660 MW. How many joules of energy are wasted in ONE second?
6. 4(ii)3 marks· CSEC Physics · 1993 · Paper 2The power of the transmitter is 200 kW. What is the total energy in a pulse?
7. 1(f)4 marks· Physics Q1 1(f)Given that the power supplied to the immersion heater was kept constant at 40 W, calculate the time taken for 18.0 kJ of energy to be supplied.
8. 1(g)(i)3 marks· Physics Q1 1(g)(i)Calculate the power delivered to the resistor, R, by the secondary windings.
9. 1(g)(ii)1 mark· Physics Q1 1(g)(ii)Calculate, also, the power input to the primary windings by the source.
10. 2(b)(ii)4 marks· Physics Q2 2(b)(ii)If this activity takes 25 seconds to complete, calculate the power utilized in kilowatts.
11. 2(b)(ii)3 marks· Physics Q2 2(b)(ii)If this melting and heating activity took place over 300 s, calculate the rate at which the ice / water was receiving heat.
12. 2(b)(iii)1 mark· Physics Q2 2(b)(iii)If friction was present, what effect if any, would this have on the power needed?
13. 2(c)(iii)3 marks· Physics Q2 2(c)(iii)When the lamp is lit, 4 W of the energy supplied is lost as heat. Calculate the efficiency of the lamp.
14. 3(c)(i)3 marks· Physics Q3 3(c)(i)Calculate the heat energy supplied by the heating element in 2 hours.
15. 4(b)(i)4 marks· Physics Q4 4(b)(i)Calculate the power provided by the motor.
16. 4(b)(ii)2 marks· Physics Q4 4(b)(ii)Calculate how much energy per day can be used to heat water if the collector emits 50% of the heat energy it receives from the atmosphere.
17. 4(b)(iii)9 marks· Physics Q4 4(b)(iii)What is the average rate of energy conversion of the cyclist and cycle if the descent in part (ii) takes 1 minute at constant speed?
18. 5(b)(ii)3 marks· Physics Q5 5(b)(ii)If the activity at (b) (i) took place in 6000 s, how much power was utilized?
19. 5(b)(iii)4 marks· Physics Q5 5(b)(iii)During the two-week period, 15.5 kWh of energy was lost as heat from the bulb. Determine the efficiency of the bulb.
20. 5(b)(iii)3 marks· Physics Q5 5(b)(iii)In a certain section of road, 200 KW of power is expended to charge 100 cars. If each car converts 600 Watts of power to charging the battery, calculate the conversion efficiency.