Power

3. Power

Power as the rate of doing work or rate of energy conversion.

Unit Watt (W)

P = Work / time

= Energy converted / time

Percentage efficiency

= Power output x 100

Power input

Estimation of average power

developed by

• person running upstairs

• person repeatedly lifting weights, etc.

Appropriate calculations.

Power of devices, e.g. light

bulbs, motors, etc.

A general talk thru is here

http://www.sei.ie/Schools/Secondary_Schools/Subjects/Physics/Unit_3_-_Power/Definition_of_Power/

How powerful are you?

How could you calculate your personal power?

http://www.sei.ie/Schools/Secondary_Schools/Subjects/Physics/Unit_3_-_Power/Personal_Power/

How effiecient are machines ?

http://www.sei.ie/Schools/Secondary_Schools/Subjects/Physics/Unit_3_-_Power/Percentage_Efficiency/

Some examples of effiecency!

http://www.sei.ie/Schools/Secondary_Schools/Subjects/Physics/Unit_3_-_Power/Efficiency_Demo/