Energy and power
When Energy transferred by a force. Work done = force Ă— distance moved in the direction of the force. is done on an object, energy is transferred.
Energy transferred = work done, and so we can also say:
Power is the amount of work done in one second.
Power is measured in watts (W).
Calculating power
Power can be calculated using either of these equations:
| power = \(\frac{\text{work done}}{\text{time taken}}\) | power = \(\frac{\text{energy transferred}}{\text{time taken}}\) |
| power in watts (W) | power in watts (W) |
| work done in joules (J) | energy transferred in joules (J) |
| time in seconds (s) | time in seconds (s) |
| power = \(\frac{\text{work done}}{\text{time taken}}\) |
| power = \(\frac{\text{energy transferred}}{\text{time taken}}\) |
| power in watts (W) |
| power in watts (W) |
| work done in joules (J) |
| energy transferred in joules (J) |
| time in seconds (s) |
| time in seconds (s) |
power = \(\frac{\text{work done}}{\text{time taken}}\)
work = power x time taken
time taken = \(\frac{\text{work done}}{\text{power}}\)