Determine the new current value | on ElectriciansForums

Discuss Determine the new current value in the UK Electrical Forum area at ElectriciansForums.net

A

Andre36

Hi all.

Freshman electrical installations student here.

Please can someone help me with figuring out the formula to the following question, it's driving me nuts.

The current through the field windings of a motor is 1.8 amperes when the resistance is 100 ohms. After 5 minutes the resistance rises to 120 ohms. If the potential difference remains constant determine the new value of current flow. This is driving me nuts, because I have the answer but I cannot figure out the formula/how to get the answer.

Please can someone help me with what formula is, I have the answer but can't figure out how to reach it.

Thanks.
 

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