Electrical Quantities · CSEC Physics

24 past-paper questions on Electrical Quantities, part of Electricity and Magnetism, from every CSEC Physics paper on Quelpr.

1. 5(b)(i)3 marks· CSEC Physics · 1990 · Paper 2Calculate the maximum permissible current in the resistor.
2. 5(b)(ii)1 mark· CSEC Physics · 1990 · Paper 2The resistor is connected to an a.c. supply and an alternating current flows with a peak value equal to the maximum permissible current. Explain why the rate of energy conversion using a.c. will be less than that using…
3. 1(a)(i)3 marks· CSEC Physics · 1991 · Paper 2Calculate the energy consumption of the refrigerator per month.
4. 3(b)(i)3 marks· CSEC Physics · 1993 · Paper 2Calculate the electrical energy that is stored in the machine.
5. 3(b)(i)4 marks· CSEC Physics · 1995 · Paper 2What is the cost per year of the operation of the water-heater if one kilowatt-hour costs 40 cents?
6. 3(b)(ii)2 marks· CSEC Physics · 1995 · Paper 2To save money, the family considers installing a solar water-heater costing $4 400. How many years must pass before the cost of the solar heater is equal to the cost of the electrical energy saved (the "pay-back time")?
7. 6(b)(ii)3 marks· CSEC Physics · May/June 2022 · Paper 2Calculate the voltage, given that the power supply of the cellphone is 4.4 W.
8. 6(b)(iii)3 marks· CSEC Physics · May/June 2022 · Paper 2Determine the work done to fully charge the cellphone battery.
9. 2(c)(i)3 marks· Physics Q2 2(c)(i)A fluorescent lamp is rated at 15W, 120V. Calculate the current which the lamp draws from the main supply.
10. 2(c)(ii)4 marks· Physics Q2 2(c)(ii)Calculate the energy, in kJ, added to the battery.
11. 2(c)(iii)2 marks· Physics Q2 2(c)(iii)Suggest, with a reason, a value for the voltage of the solar module during battery charging.
12. 4(b)(ii)4 marks· Physics Q4 4(b)(ii)Calculate the current drawn from the d.c. supply.
13. 4(b)(ii)1 mark· Physics Q4 4(b)(ii)We assume that the useful energy transferred to the solar panel is a constant, k, times the decrease in frequency of the e.m. waves. (E = kΔf). State the corresponding energy transferred, E₁, in terms of k.
14. 4(b)(iii)3 marks· Physics Q4 4(b)(iii)Calculate the maximum power dissipated in the resistor.
15. 4(b)(iii)1 mark· Physics Q4 4(b)(iii)If the power required to lift the appliance was greater, what effect would this have on the value of the current? Assume the voltage rating remains constant. [g = 10 N Kg-1]
16. 5(b)(i)4 marks· Physics Q5 5(b)(i)Calculate the total energy in kW h that the bulb will consume during the two-week period.
17. 5(b)(ii)1 mark· Physics Q5 5(b)(ii)Given that Rasheed's electricity rate is $0.26 per kWh, calculate his electricity charges for the bulb for the two weeks.
18. 5(c)(i)1 mark· Physics Q5 5(c)(i)Calculate the total power consumed by these devices.
19. 5(c)(ii)2 marks· Physics Q5 5(c)(ii)These devices are in use for 4 hours per day. Calculate the energy consumed in kilowatt-hours in a 30-day month.
20. 5(c)(iii)2 marks· Physics Q5 5(c)(iii)Calculate the bill for the month if each unit of electricity costs 40¢.
21. 5(d)4 marks· Physics Q5 5(d)The resistance meter is removed and a battery is connected across P and Q. What should be the voltage of the battery in order to deliver the rated power to both A1 and A2? SHOW ALL YOUR WORKING.
22. 6(b)(i)4 marks· Physics Q6 6(b)(i)Calculate the input power of the transformer.
23. 6(b)(iii)3 marks· Physics Q6 6(b)(iii)When the current in (b) (ii) flows, what is the power dissipated in the 3Ω resistor?
24. 6(b)(iii)9 marks· Physics Q6 6(b)(iii)Calculate the electrical power dissipated in the lamp.