How can i calculate the resistance of this electromagnet?

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SUMMARY

The discussion centers on calculating the resistance of a 12V DC electromagnet with a specified power consumption of 5 watts and a current rating of 0.42A. Users confirm that the resistance can be calculated using Ohm's Law, specifically the formula: Resistance = Voltage / Current. The electromagnet's specifications and potential manufacturer identification (KIMKE) are also discussed, highlighting the importance of obtaining a datasheet for precise calculations.

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berkeman said:
It looks like the picture has some light words across it -- KIMKE something. Could that be the manufacturer? Otherwise, can you e-mail the seller and ask if they know, or if they have a datasheet?
The ebay post says the electromagnet uses 5 watts, can i plug that into the equation, 5 watts = 12 volts^2 / Resistance ??
 
radaballer said:
The ebay post says the electromagnet uses 5 watts, can i plug that into the equation, 5 watts = 12 volts^2 / Resistance ??

Yeah, good idea. :smile:
 
Current is listed as 0.42A in the specs. So you could also divide voltage by current (simple ohms law). Same result.
 

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