Reply to "Wiring Multiple LEDs with SPST Switches"

cjackOGR Forum Member DIGITAL SUBSCRIBER

Well...it depends on the resistor value. If you are limiting the current to 20 ma, then the wattage dissipated it I^2 times R or .000400 times R in watts. But double that for good measure. For example, .000400 times 470 ohms equals .188 watts. So doubling is .376 watts. I guess 1/4 watt resistor would be a safe choice even though it's not double. In the case of 10 ma, that would be .000100 times 470 or .047 watts. Doubling would be .094 and 1/8 watt resistor is quite adequate.

3/22/197:59 PM

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