Electrical Power and Energy
Physics ⇒ Electricity and Magnetism
Electrical Power and Energy starts at 8 and continues till grade 12.
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See sample questions for grade 10
A 100 W bulb is switched on for 5 hours daily for 30 days. Calculate the total energy consumed in kWh.
A 1200 W microwave oven is used for 15 minutes. How much energy does it consume in joules?
A 1500 W electric kettle is used for 20 minutes. Calculate the energy consumed in kWh.
A 240 V electric iron takes a current of 5 A. What is its power rating?
A 500 W refrigerator runs for 8 hours a day. How much energy does it consume in a day in kWh?
A 60 W lamp is connected to a 120 V supply. Calculate the current drawn by the lamp.
A 60 W lamp is used for 10 hours. How much energy does it consume in joules?
A 75 W fan is used for 4 hours daily for 10 days. Calculate the total energy consumed in kWh.
A heater draws a current of 5 A from a 220 V supply. Calculate the power consumed by the heater.
A household uses 250 units of electricity in a month. If 1 unit = 1 kWh, how much energy is used in joules?
Explain why electrical energy is transmitted at high voltages over long distances.
If a bulb is rated 100 W, what does this rating mean?
If a device uses 2 kW of power for 3 hours, how much energy does it consume in kWh?
If the voltage across a resistor is doubled, what happens to the power dissipated by the resistor (assuming resistance is constant)?
If two bulbs of 60 W and 100 W are connected in parallel to a voltage supply, which bulb will glow brighter?
State the relationship between electrical energy, power, and time.
A 150 W television is used for 2 hours daily for 15 days. Calculate the total energy consumed in kilowatt-hours (kWh).
A 2000 W water heater is used for 45 minutes. Calculate the total energy consumed in joules.
A 60 W bulb and a 100 W bulb are connected in series to a 220 V supply. Which bulb will glow brighter?
A device operates at a voltage of 110 V and draws a current of 3 A. What is the power consumed by the device?
