Energy and Power
This quiz covers fundamental concepts of energy and power in physics, including power calculations, units, formulas, and the relationship between energy, work, and power.
Questions
An LED light uses 150 J of energy in 3 seconds. What is its power?
- 50 watts
- 30 watts
- 10 watts
- 450 watts
A light bulb uses 500 J of energy in 5 seconds. What is its power? (Remember: P = E ÷ t)
- 50 watts
- 500 watts
- 10 watts
- 100 watts
Power is often expressed in joules per second, which is also equal to:
- 10 joules
- 1 watt
- 100 joules
- 10 watts
What formula is used to calculate power?
- power = energy ÷ time
- energy = power ÷ time
- power = time ÷ energy
- power = energy x time
True or False: If two people push a heavy box, the one who pushes the fastest is more powerful.
- TRUE
- FALSE
The rate at which work is done is referred to as _____.
- force
- energy
- power
- distance
In what unit of measurement is energy expressed?
- m/s2
- Newtons
- Joules
- meters
Which of the following examples proves that the work done by energy is not always visible?
- a boy throwing a baseball
- a fire heating up a room
- a man pulling a suitcase
- a gardener pulling up weeds
True or False: Energy is NOT always transferred when work is done.
- TRUE
- FALSE
What term is used to describe the ability to do work?
- force
- transference
- energy
- power