The table shows information about three electrical appliances connected to a UK mains supply.
| Appliance | Power in W | Current in A |
|---|---|---|
| Smart-home hub | 11.5 | 0.05 |
| Laser-cutter | 2760 | 12.0 |
| Active speaker | 184 |
State the relationship between power, current, and potential difference (voltage).
Calculate the current in the active speaker. [assume that the mains voltage is 230 V]
The diagram shows the different power cables used for the high-power laser-cutter and the low-power smart-home hub.
Suggest why the wires in the laser-cutter cable are thicker than the wires in the smart-home hub cable.
In the three-core cable, wire C is the live wire, wire B is the neutral wire, and wire A is the earth wire. Which of the three wires is connected to the fuse?
Suggest why the smart-home hub is safe to use, even though its cable only has two wires and lacks wire A.
The smart-home hub is switched on for 80 minutes. Calculate the energy transferred to the hub during this time.
