AQA GCSE Combined Science: Synergy · 8465

Power

What you need to know

Define power as the rate at which energy is transferred or the rate at which work is done.
Understand that an energy transfer of 1 joule per second is equal to a power of 1 watt.
Explain how the power transfer in any circuit device relates to the potential difference across it, the current, and energy changes over a given time.
Recall and apply the equations relating power, energy transferred, work done, and time: $P = \frac{E}{t}$

t

E

P = \frac{W}{t}

Recall and apply the equations relating power to potential difference, current, and resistance:

P = V I

P = I^2 R