Power

• What is power?


  Power is the rate of energy transfer, or the rate of doing work.
• What is power measured in?

  Watts, W.
• What is one watt equivalent to?

  One joule transferred per second (J/s).
• Give one equation you could use to calculate power, what do each symbol represent and what are the units?

  P = E / t. P = power (W) E = energy transferred (J) t = time (s)
• Give one equation you could use to calculate power, what each symbol represents and what are the units?

  P = W / t. P = power (W) W = work done (J) t = time (s)
• A powerful machine is not necessarily ...

  ... one which can exert a strong force ( although it usually ends up that way).
• What is a powerful machine?

  One which transfers a lot of energy in a short space of time.