when voltage gets down the current of motor increases. but
according to Ohm's law voltage is directly proportional to
current. plz explain
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Answer / abc
If Motor is of 20 KW DC/AC Type then we can calculate P=VI,
or P=VISin* here power is constant so, V is inversely
propotional to I.
Is This Answer Correct ? | 31 Yes | 0 No |
Answer / narayana rao veeramalla
ohms law states that at constant temperature current
directly proportional to voltage and inversely to resistance
it doesn't involved any constant power concept... As the
potential you apply across the conductor increases the
current carrying electrons flow definitely increases...
here the question is for a constant power output motor...
for keeping the L.H.S constant the R.H.S two variables will
be in inversely proportionate in power equation P=VI....
Is This Answer Correct ? | 15 Yes | 0 No |
Answer / rohit kumar jha
Two type of emf's are there in motor, first one is due to the
magnetic field set up by the stator and second one is due to
the current flowing in the armature(rotor).
Due to the first emf, a current is set up in the armature,
which is resisted by the current due to the supplied
voltage.As the voltage value decreases the current decreases,
which decreases the resistance to the first current(as both
are opposite in direction), hence the value of current
increases.
It's really a nice and a tricky question :))))
Is This Answer Correct ? | 3 Yes | 0 No |
ohm's law is used only for d.c supply not for a.c supply
Is This Answer Correct ? | 6 Yes | 23 No |
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