Power
Physics ⇒ Mechanics
Power starts at 8 and continues till grade 12.
QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Power.
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When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 10
A 60 W lamp is left on for 10 hours. How much energy does it use in kilowatt-hours?
A 75 kg athlete runs up a 10 m high hill in 20 seconds. Calculate the average power developed. (Take g = 10 m/s²)
A car engine does 30,000 J of work in 20 seconds. What is the power output of the engine?
A light bulb is rated at 60 W. How much energy does it use in 2 hours?
A machine does 2000 J of work in 10 seconds. What is its power output?
A motor lifts a 20 kg load vertically upward at a constant speed of 2 m/s. What is the power output of the motor? (Take g = 10 m/s²)
A person climbs a staircase of height 5 m in 10 seconds. If the person's mass is 60 kg, what is the average power developed? (Take g = 9.8 m/s²)
Explain the difference between power and energy.
Explain why two people doing the same work in different times have different power outputs.
If a 100 W electric fan runs for 3 hours, how much energy does it consume in kilojoules?
If a 1500 W heater is used for 30 minutes, how much energy is consumed in kilojoules?
If a machine has a power rating of 500 W, how much work can it do in 4 seconds?
If a person lifts a 50 kg box to a height of 2 m in 5 seconds, what is the average power used? (Take g = 10 m/s²)
What is the SI unit of power?
