Quote:
Originally Posted by Electronic M
Air valve is operated by a 14-15 voltage, depending on your charging system. To calculate the current you'd use Ohm's law Current = voltage/resistance. Since we have the voltage and the resistance, we can calculate the current, 14v/220ohm =.064amp. Now to calculate power you'd need need to use voltage * current, that would be 14volts * .064amp = .896 watts. So the reason your resistor is getting hot is because its half the size it should be. You'd need at least 1 watt 220 ohm resistor.
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Actually, the resistor is 22 Ohm so it's close to 10W
However, saw someone mentioning that measuring resistance over the valve is not representative because it's an inductive load - any input on if I could actually get away with a higher resistance to lower the current through it?