Year 12s: what will be the first way you research your future options? >>

Question on fuses help

I had a question on fuses in a recent test that I did.

It asked me to find a fuse that would be most suitable. I had a choice between 3A, 5A, 7A and 10A. The current in the circuit was 0.75A or something along those lines, so I chose 3A.

The next question, which is what I need help on, was asking me why the other fuses wouldn't be suitable. I think what I said would have been right, but just to clarify, I would like to ask what would be expected in a GCSE answer. I think it was 2 or 3 marks.

Thanks in advance

Reply 1

Eau

Using 5A or higher fuses would pose a risk because this means 5A could be reaching the wires and could potentially melt the wires (it gets v. hot). This could pose a fire hazard in the house!

Reply 2

sufiankane

another reason is that say the device could handle 0.75A and a current of 3A came thrugh the fuse will blow, if one of 13A came through because of the fuse the 13Amps could easily start a fire or some very dangerous sparking.