Answer: In DC motors, Voltage equation is V=Eb – IaRa (V = Terminal voltage,Eb = Back emf in Motor,Ia = Armature current,Ra = Aramture resistance).At starting, Eb is zero. Therefore, V=IaRa, Ia = V/Ra ,where Ra is very less like 0.01ohm.i.e, Ia will become enormously increased. In simple words we can say at starting there is no back emf, that is why the current is high.
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