# Chapter 15 Power. just like the word “work”, power has a different meaning in the science world power tells you how fast work is being done.

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Chapter 15 Power

just like the word “work”, power has a different meaning in the science world power tells you how fast work is being done

Power the rate at which work is done, or the amount of work per unit of time

How to Calculate Power Power = Workor Force*Distance TimeTime Units are defined as a watt (W) or a joule/second

Watt the watt is used to express electrical power examples = light bulbs & appliances

Watt a 50-watt light bulb does work at a rate of 50 joules per second a 110-watt light bulb has more power than a 50- watt light bulb

Kilowatts (kW) large quantities of power are measured in kW 1 kW = 1000 W this is how power in your home is measured

Remember the Procedure Write the equation Figure out what is being asked – what are you solving for? Determine what information is given Plug & Chug – don’t forget the units!

Problem A small motor does 4000 J of work in 20 seconds. What is the power of the motor in watts?

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