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I with P and R

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Ohms Watts Home

Electrician Math Home

Electrician Education Home

The resistance equals the voltage squared divided by the wattage.

If you know the voltage, you can square it, then divide the result by the wattage. The result will be resistance.

Example: If the voltage is 120 volts, then 120 squared equals 14,400. Divide this by 100. The result is 144 which is the resistance in ohms.

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