English, asked by babavali, 1 year ago

rheostat capacity and inductor symbols

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Answered by anchy
2
a 5W 50R rheostat is rated to carry 316mA (max. current = sq.root[rheo wattage/resistance]) but a 5W 100R one will only carry 223mA. Think of it like fuse wire - if just the last turn carries too much current, the rheostat won't be producing 5W of heat, but that bit of wire will melt.

Power rating needed for a 200mA fan system with a 50R rheostat is IxIxR =2W, based on the current flowing with the fan at full speed. But if we used a 100R rheostat with the same fans the wattage would need to be 4W.

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