The fuse in an electric device is always connected to the

1. Analyze the question The question asks which wire of a mains supply the fuse should be placed on in an electric device.

2. Explain the concept A fuse is a safety device containing a thin wire that melts when too much current flows, breaking the circuit. In household wiring there are three wires:

• Live wire: carries the high voltage (about 230 V in Nigeria).
• Neutral wire: completes the circuit and is near 0 V.
• Earth wire: a safety path to the ground for faults.

3. Solution When the fuse blows, it must disconnect the device from the dangerous high-voltage source.

• If the fuse were on the neutral side, then after it blew, the live wire would still be connected to the appliance. The appliance body or internal parts could remain at 230 V, and anyone touching it could be electrocuted.
• The earth wire must never have a fuse, because it needs to stay connected to carry fault current safely away.
• "Terminal side" is not a standard wiring term.

So the fuse is placed on the live side. When it blows, the appliance is completely cut off from the high voltage.

4. Answer C. live side of an electric supply

5. Tip Remember: "Fuse and switch go on the LIVE." Both are meant to cut off danger, so they must break the live wire, never the neutral or earth.