How can i calculate the resistance of this electromagnet?

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Discussion Overview

The discussion revolves around estimating the resistance of a specific electromagnet listed on eBay, focusing on the application of electrical principles to derive this value. Participants explore different methods to calculate resistance based on the specifications provided in the listing.

Discussion Character

  • Technical explanation
  • Mathematical reasoning

Main Points Raised

  • Some participants seek a ballpark estimate of the resistance for the electromagnet based on its specifications.
  • There is a suggestion to identify the manufacturer from the image on the eBay listing, with a proposal to contact the seller for more information or a datasheet.
  • One participant notes that the electromagnet uses 5 watts and questions if this can be used in the equation \(5 \text{ watts} = \frac{12 \text{ volts}^2}{\text{Resistance}}\).
  • Another participant agrees with the idea of using the power specification to calculate resistance.
  • Current is specified as 0.42A, leading to a suggestion to apply Ohm's law by dividing voltage by current to find resistance, which is noted to yield the same result.

Areas of Agreement / Disagreement

Participants generally agree on the methods to estimate resistance using the provided specifications, but there is no consensus on the exact resistance value due to the lack of definitive data from the seller.

Contextual Notes

The discussion relies on the assumptions that the provided specifications (power and current) are accurate and that the standard equations for resistance apply. There is no confirmation of the manufacturer's details or additional specifications that could affect the 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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