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how many watts are 4ohm

by Guest7963  |  12 years, 9 month(s) ago

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how many watts are 4ohm

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  1. paafamily
    Ohms does not equal watts. You need to know what voltage is across the resistor to determine how many watts it is drawing or how many watts the resistor should be rated for.

    Power is the voltage across the resistor SQUARED divided by the resistance. If this 4 ohm resistor has 12 volts across it then the watts power is (12 x 12) / 4 = 36 watts.

    1 Watt equals 1 Volt times 1 Amp.

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