[Mgs] Fuses

[Paul Hunt]

This was answered right at the very beginning - amps is amps and is 
dependant on the actual voltage and resistance (i.e. Ohm's Law) in a 
circuit.  A fuse has a resistance (albeit very small) of its own, current 
flowing through it causes a voltage to be dropped across it and hence watts 
in the form of heating power developed in it.  When the heating effect 
exceeds the melting point of the fuse wire it melts and breaks the circuit. 
A fuse designed to blow at 35 amps is going to do so regardless of whether 
the voltage in the circuit is 1.2v, 12v, 120v or 1200v.  What happens 
*after* the fuse blows does depend on the maximum voltage rating of the fuse 
and the voltage in the circuit, but that can be ignored for factory fuses in 
a factory circuit on an MGB, even if those fuses *are* only rated for use up 
to 32v.  For a start it's only 12v, and secondly it would take a couple of 
thousand volts and an inductive load to jump something the length of a blown 
MGB fuse.

PaulH.

----- Original Message ----- 
> I have noticed that no one has addressed Ohm's Law.
>
> Will a fuse rated for 15 amps at 32 volts blow at about the same energy 
> level as a fuse rated for 35 amps at 12 volts?