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You don't! They are two different entities - like converting cars to washing machines!

Simply put:

Voltage is equal to resistance multiplied by current

therefore current = voltage divided by resistance

therefore a resistance of 23ohms at 230 volts will draw 10amps current.

Watts is equal voltage multiplied by current

therefore a 230volt fire drawing 10 amps equals 2.3kilowatts or 2300 watts.

Use this for one hour and your electricity usage equals 2.3Kilowatt hours, say costing approx 15p per KWH = 34.5 pence.

Tom.

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