Amps are amps...right?
Be nice ok? Size of wire determines current capacity (amps) as I believe. Recently had to replace a 30 amp fuse(U shaped). Had small size about same as a dime but needed next larger, about size of...
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Sam Spade wrote:LOL. You can't put either 12 or 120 volts across a 30 A fuse. It will blow immediately. Fuses are there to protect the other stuff in the circuit, which is where almost all of the voltage drop occurs. At full load, an AGC-30 fuse will have about 0.12 V across it. The 0.002 ohm is when cold, at full load the link heats up a bit and the resistance increases to about 0.004.
The voltage drop across the resistance of the fuse causes heat, which melts the fuse element.
30 amps flowing at 12 volts makes about 10 percent of the heat across the fuse as 30 amps flowing at 120 volts.
road-runner wrote:Only that the fuse will blow long before the current gets to 3000 amps.
I=V/R. 6 volts divided by 0.002 ohms = 3,000 amps. Did I go wrong somewhere?
