1. Relate (without calculation) power to work done and time taken, using appropriate examples.

Power is the work done per unit time.

e.g. the power of an engine would be the work it does on the car per second.

Or the power of an elevator system would be the work it does lifting people per second.

 

  1. Recall and use the equation P = E/t in simple systems.

P = E/t

Where P is power in watts (W),

E is the energy expended or work done in joules (J),

And t is the time take in seconds (s).

You can use this formula to calculate Power, energy transferred/ work, or time taken if you have two of these three values.

 

 

Notes submitted by Sarah.

Click here to go to the next topic.

Click here to go to the previous topic.

Click here to go back to the Science menu.