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 8
A 100 W bulb is used for 5 hours. How much energy does it consume?
A 1500 W heater is used for 2 hours. How much energy does it consume in joules?
A 2000 W air conditioner runs for 3 hours. How much energy does it use in kWh?
A 75 W fan runs for 8 hours. How much energy does it use in kWh?
A television set is rated at 120 W. If it is used for 3 hours daily for 30 days, what is the total energy consumed in kWh?
A toaster uses 800 W of power. If it is used for 15 minutes, how much energy does it consume in Wh?
A washing machine is rated at 1500 W. If it runs for 2 hours, how much energy does it consume in kWh?
Explain why it is important to use energy-efficient appliances at home.
If a 1200 W microwave oven is used for 30 minutes, how much energy does it consume in Wh?
If a 60 W bulb is left on for 10 hours, how much energy does it use in kWh?
If a device operates at 230 V and draws a current of 2 A, what is its power consumption?
If a device uses 500 J of energy in 10 seconds, what is its power?
If a lamp is rated at 60 W and operates at 120 V, what is the current flowing through it?
If a refrigerator uses 2 kWh of energy per day, how much energy does it use in a 30-day month?
What does the term 'power rating' of an electrical appliance mean?
What is the formula for electrical power in terms of voltage and current?
What is the relationship between power, voltage, and resistance?
