Fuses Flashcards
what is the role of a circuit breakers
a device that switches off the flow of Current if the current is higher than a certain value
why are circuit breakers better than fuses
1) circuit breakers may be used more than once
2) circuit breakers also break the circuits quicker than fuses
how does a fuse work in order to stop the flow of current
fuses contain a thin wire that melts if the current is too high
what current flows through a 1.15KW with a voltage of 230V
1150 Watts / 230V = 5A
Why is a 13 A fuse wrong to use for an appliance with a 3.9 A operating current?
More than three times the normal operating current is needed to melt the fuse.
the 13 A fuse might not melt if the appliance developed a fault.
The potential difference across the mains power supply in the UK is what?
230V
