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
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.
What is the definition of power in physics?
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.
Which formula correctly represents power?
(1) Power = Force × Distance
(2) Power = Work / Time
(3) Power = Mass × Acceleration
(4) Power = Energy × Time
Which of the following appliances uses the most power?
(1) 60 W light bulb
(2) 100 W fan
(3) 1500 W heater
(4) 500 W refrigerator
Which of the following best describes the relationship between power, work, and time?
(1) Power = Work × Time
(2) Power = Work / Time
(3) Power = Time / Work
(4) Power = Work + Time
Which of the following is a correct relationship?
(1) Power = Energy × Time
(2) Power = Work / Time
(3) Power = Force / Distance
(4) Power = Mass × Velocity
Fill in the blank: 1 kilowatt (kW) is equal to ______ watts.
Fill in the blank: 1 Watt is equal to 1 ______ per second.
Fill in the blank: Power = ______ × Velocity (when force and velocity are in the same direction).
Fill in the blank: Power is measured in ______ in the International System of Units (SI).
True or False: Power can be calculated by dividing work done by the time taken.
True or False: Power can be calculated using the formula Power = Force × Velocity when force and velocity are in the same direction.
True or False: Power can be increased by doing the same work in less time.
True or False: Power is the same as energy.
