All Alloy Cup progress

[andrew34ruby]

My physics should be better really but
If you had a rectangular flat fuse rated at 30 amp
And you cut it in half, along its length would that then give you a
2 x 15 amp fuses?

Presumably any fuse wire needs to be rated at 6v?
As it’s the power = V x A that would determine the energy
needed to melt the fuse material.

Someone smarter than me will know?

Regards

Bill G

Bill, the power V x A is the total power that creates heat or magnetism anywhere in the circuit. Most of this is at the headlight/horn/motor and not at the fuse. To calculate the heat produced at the fuse you use the formula    Amps squared x resistance in ohms. So voltage doesn't come into it.
And yes, slicing your 30 amp fuse would make two 15 amp fuses. You would be doubling the resistance, but also halving the power required to 'blow' the fuse.

Hope I got this right! I was very good at O level physics, but that was 48 years ago.