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Question:

Can you tell me the Watts required by a 230v, 50Hz Single phase AC motor?

I have tested 4.8 ohms across the windings.I worked out I = U/R = 230/4.8 = 47.92 AP = IU = 47.92 X 230 = 11020 w I don't know if this is right or a little bit high.The motor has a DOL starter that's not working, but There seems to be no problem with the cables upto it.You would be doing me a big favour if you could answer this question thanks.

Answer:

The static resistance will bear little relationship to the running load. As the motor speeds up the back-emf builds up too until it opposes the supply so much that it won't go any faster. There's no real way to predict how much power it will draw apart from running it and measuring the current when it's working - but it will be a great deal less than what you'd calculate from a passive resistor. Is there no data-plate anywhere on it?

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