Discussion
The starting current of an induction motor is high because at standstill the machine behaves as
Answer: A
Correct answer: a short-circuited transformer
At standstill the slip is unity, the rotor is a shorted secondary at full supply frequency, and the only thing limiting the current is the leakage impedance. Five to seven times rated current is the usual result. As the machine accelerates the effective rotor resistance \( R_2/s \) rises, the current falls, and the machine settles at its running point - which is why the high current lasts only for the run-up.
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