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A dc motor with its rotor and field coils connected in series has an internal resistance of 3.2 ω. when running at full load on a 120-v line, the emf in the rotor is 105 v.
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Mar 3, 2019
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A dc motor with its rotor and field coils connected in series has an internal resistance of 3.2 ω. when running at full load on a 120-v line, the emf in the rotor is 105 v.
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Paritosh
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Missing question:
what is the
current drawn by
the motor
from
the
line?
Solution:
The potential difference between the two ends of the motor is
where
is the emf, I the current and r the internal resistance of the motor.
By re-arranging the equation and using the data of the problem, we can solve to find the current I:
NeilD
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Mar 9, 2019
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NeilD
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