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Question
How power is related to work?
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Solution
They both involve energy transfer.
Work done IS the energy transferred when a force moves a load Work done = force distance moved in direction of force. Work has units of Joules
Power is the rate of energy transfer Power = energy /time
Where they might both be used is when calculating the power of a machine,
Power of machine = work done / time taken
Remember, work done is the energy transferred, so these terms are interchangeable in the power equation.
Example - a person lifts a 10 kg mass, moving it a distance of 1.5m, in 2 seconds. Calculate the persons power output:
Takeg=10Nkg
Weight =mg=10⋅10=100N
Work =100N⋅1.5m=150J
Power =150J2s=75W
Work is force applied to move something over a distance.W=Fs
Power is work divided by time.P=W/t=Fs/t
They both involve energy transfer.
Work done IS the energy transferred when a force moves a load Work done = force distance moved in direction of force. Work has units of Joules
Power is the rate of energy transfer Power = energy /time
Where they might both be used is when calculating the power of a machine,
Power of machine = work done / time taken
Remember, work done is the energy transferred, so these terms are interchangeable in the power equation.
Example - a person lifts a 10 kg mass, moving it a distance of 1.5m, in 2 seconds. Calculate the persons power output:
Takeg=10Nkg
Weight =mg=10⋅10=100N
Work =100N⋅1.5m=150J
Power =150J2s=75W
Work is force applied to move something over a distance.W=Fs
Power is work divided by time.P=W/t=Fs/t
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