A small local generator supplies electricity to a community at a potential difference of 12,000 V12,000\text{ V}12,000 V.
The energy transferred by the generator in one second is 360,000 J360,000\text{ J}360,000 J.
Calculate the charge flow from the generator in one second. Use the equation:
charge flow=energypotential difference \text{charge flow} = \frac{\text{energy}}{\text{potential difference}} charge flow=potential differenceenergyThe electricity supply is stepped down to 240 V for use in a workshop. The table below shows the current in some machines in the workshop when running:
| Machine | Current (A) |
|---|---|
| Lathe | 8.20 |
| Drill | 1.50 |
| Sander | 2.30 |
Calculate the total power of all these machines running at the same time. Use the equation:
power=potential difference×current \text{power} = \text{potential difference} \times \text{current} power=potential difference×current