Transmision and Distribution of Electricity (5)

Fuse

Is a fine and short wire that heats up easily and melts when the current flowing through it exceeds the value of the fuse

Effect when the wire on the fuse melts

The electricity supply will be cut off

Types of fuses usually used

- Cartridge fuse - Replaceable wire f

Cartridge fuse

Replaceable wire fuse

Uses of fuse

Function as electrical safety devices in circuits or electrical appliances to protect the wires and appliances from any excessive current flow

The value of a fuse

Is the maximum value of current that can flow through the fuse without causing its fuse wire to melt

Choosing the value of a fuse (1)

Depends on the value of the maximum current that flows through a circuit or electrical appliance

Choosing the value of a fuse (2)

The fuse to be used should have a value which is slightly higher than the maximum current that flows through a circuit or electrical appliance in normal operating condition

Example of the cause of a short circuit

Damaged wire insulation, so exposed live wires are touching with an exposed neutral wire

Science

Question

Transmision and Distribution of Electricity (5)

Transmision and Distribution of Electricity (5)