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...
Forum Discussion
Sam Spade wrote:mike-s wrote:
But that's the wattage within the fuse itself, not the number of watts in the circuit being fused.
Which is why the voltage makes a difference.
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.
No sir, I'm sorry but that's not correct. Voltage doesn't make heat - current does. Your body can conduct hundreds of thousands of volts (with tiny current levels) and not be burned. Do the oposite with current and you fry!
The fuse doesn't care about voltage at all unless it was so high it could jump across or out of it. It's very easy to contain such low voltage - so easy that most wire is rated well beyond 300 volts, 600 being more the norm.
Someone else said it had to do with ohms law - it doesn't. It is soley the heat caused by current that melts the fuse.
Those that are suggesting voltage has something to do with it need to read up on the current/coulombs relationship with special attention to what is not involved.
