In the household electric circuit, if one bulb is fused in a room, the other bulbs keep glowing. Explain the reason.

Draw a labelled diagram with the necessary switches to connect a bulb, a fan and a plug socket in a room with the mains. In what arrangement will you connect them to the mains?

Can we use copper wire as a fuse wire? Give reason.

Which fuse wire is thick: 5 A or 15 A?