subject

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. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 8
A 100 W bulb is used for 10 seconds. How much energy does it consume?
A 1500 W microwave is used for 2 minutes. How much energy does it use?
A 2000 W kettle is used for 3 minutes. How much energy does it use?
A car engine does 10,000 J of work in 50 seconds. Calculate the power of the engine.
A machine does 200 J of work in 10 seconds. What is its power output?
A motor does 3000 J of work in 60 seconds. What is its power?
A person runs up a hill and does 600 J of work in 30 seconds. What is their power output?
A student climbs a staircase and does 500 J of work in 25 seconds. What is the student's power output?
Explain the difference between power and work.
Explain why a powerful engine can do the same work in less time than a less powerful engine.
Explain why two people doing the same work in different times have different power outputs.
If a light bulb uses 60 J of energy in 2 seconds, what is its power rating?
If a machine has a power rating of 500 W, how much work can it do in 10 seconds?
If a person does 1200 J of work in 4 minutes, what is their power output in watts?
If a person lifts a 50 N box to a height of 2 meters in 5 seconds, what is the power used?
What is the definition of power in physics?
A crane lifts a 250 kg load vertically upward to a height of 12 meters in 15 seconds. Calculate the average power output of the crane. (Take g = 9.8 m/s2.)
A cyclist applies a constant force of 100 N to move at a constant speed of 5 m/s. What is the power output of the cyclist?
A machine transfers 3600 J of energy in 3 minutes. Calculate its power in watts.
A pump raises 500 liters of water to a height of 10 meters in 2 minutes. (Assume 1 liter of water has a mass of 1 kg and g = 9.8 m/s2.) Calculate the power output of the pump in watts.