- Created by: Phillipstrumpet007
- Created on: 21-01-19 09:50
- Fuses are purposely weak parts of circuits.
- They "blow" when an electrical surge happens.
- This saves the device and means you replace the fuse
- In the fuse, there is a thin wire
- The current passes through the fuse and the wire gets hotter.
- If the current exceeds a certain value the wire melts.
- This breaks the circuit and stops the current
A disadvantage of fuses is they need to be replaced each time they blow.
- Can be alternatives to fuses.
- They detect a change in the current and safely switch off the supply.
An advantage of circuit breakers is that once a fault is fixed they can be switched back on again, whereas a fuse has to be replaced.
Another advantage of some types is that they work very quickly, so can save lives. A fuse takes time to melt and will not prevent you getting a shock if, for example, you touch a live wire.