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 11
A 100 W lamp is switched on for 10 hours. How much energy does it use in joules?
A 1200 W microwave oven is used for 30 minutes each day for 10 days. How much energy does it consume in kWh?
A 240 V electric iron draws a current of 5 A. Calculate its power rating.
A device uses 500 J of energy in 10 seconds. What is its power output?
A heater is rated at 2 kW and is used for 3 hours. Calculate the total energy consumed in joules.
A toaster has a resistance of 24 Ω and is connected to a 120 V supply. Calculate the power consumed by the toaster.
If a device operates at 230 V and draws a current of 2 A, what is its power consumption?
If the voltage across a resistor is doubled, what happens to the power dissipated by the resistor?
Describe the difference between instantaneous power and average power in an AC circuit.
