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Energy use in daily life Knowledge-Based Practice

Physics · Energy, Work & Power · Physics · Power & Efficiency

10 Physics practice questions on Energy use in daily life. Questions that assess core concepts and understanding.

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Questions

  1. 1.

    An electric oven consumes 5.4 MJ of electrical energy during 45 minutes of continuous baking. What is the average power rating of the oven?

    • A) 120 W
    • B) 800 W
    • C) 1500 W
    • D) 2000 W
  2. 2.

    A 60 W incandescent light bulb is replaced with an energy-efficient 12 W LED bulb. If the lamp is operated for 5 hours each day, how much electrical energy is saved over a period of 30 days, expressed in kilowatt-hours (kWh)?

    • A) 7.2 kWh
    • B) 9.0 kWh
    • C) 1.8 kWh
    • D) 10.8 kWh
  3. 3.

    A television set consumes 4.0 W of electrical power while remaining in standby mode. How much electrical energy does the television consume if it is kept in standby mode continuously for 250 days, expressed in kilowatt-hours (kWh)?

    • A) 24 kWh
    • B) 1.0 kWh
    • C) 96 kWh
    • D) 24,000 kWh
  4. 4.

    A 2400 W clothes dryer runs for 1.5 hours, and an 800 W dishwasher runs for 2.0 hours. What is the total electrical energy consumed by both appliances, in kilowatt-hours (kWh)?

    • A) 3.6 kWh
    • B) 4.0 kWh
    • C) 4.8 kWh
    • D) 5.2 kWh
  5. 5.

    An electric food processor operates with an efficiency of 75% while delivering 450 W of useful mechanical power. What is the total electrical power drawn by the appliance from the mains supply?

    • A) 338 W
    • B) 525 W
    • C) 600 W
    • D) 750 W
  6. 6.

    A hair dryer with a power rating of 1800 W is operated for 10 minutes. How long must a television rated at 60 W be kept on to consume the same amount of electrical energy?

    • A) 5.0 hours
    • B) 3.0 hours
    • C) 30 hours
    • D) 0.5 hours
  7. 7.

    A household LED bulb with a power rating of 15 W operates with an efficiency of 20% in producing visible light. How much useful light energy does the bulb emit during 40 seconds of operation?

    • A) 120 J
    • B) 480 J
    • C) 600 J
    • D) 3 J
  8. 8.

    An electric kettle with a power rating of 2200 W operates for 100 seconds to boil water. If 176 kJ of energy is usefully transferred to heat the water, what is the efficiency of the kettle?

    • A) 20%
    • B) 80%
    • C) 88%
    • D) 125%
  9. 9.

    A microwave oven consumes 1200 W of electrical power from the mains supply and delivers 900 W of useful power to heat food. How much energy is wasted to the surroundings during 1 minute of operation?

    • A) 300 J
    • B) 54,000 J
    • C) 72,000 J
    • D) 18,000 J
  10. 10.

    An electric water heater rated at 2.0 kW is operated for 3.0 hours each day. If the cost of electricity is $0.15 per kilowatt-hour (kWh), what is the total cost of operating the heater for a 30-day month?

    • A) $27.00
    • B) $9.00
    • C) $54.00
    • D) $90.00

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