DC motor. Calculate the current

  • Thread starter gucci
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  • #1
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Homework Statement



The coil of a DC motor has a resistance of 2.0 ohms. The motor is runned by a battery of 12 V and an internal resistance of 0.5 ohms.
a) Calculate the current at the moment the motor is started
b) Calculate the current when the motor is running at 600 RPM , when there is an induced counter EMF of 10 V in the coil.

Homework Equations



I = E / R

The Attempt at a Solution



a) is already solved I = 24 A

help with b), please
 

Answers and Replies

  • #2
BvU
Science Advisor
Homework Helper
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If you know the voltage from the internals of the battery and the voltage over the coil, what does the internal resistance of the battery see ?
 

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