题目内容
A transformer is a passive electrical device that transfers electrical energy from one electrical circuit to another electrical circuit.
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A transformer is a passive electrical device that transfers electrical energy from one electrical circuit to another electrical circuit. It cannot transfer electrical energy from one electrical circuit tomultiple circuits
The rotating magnetic field is produced by the three-phase current of the statorin the actual three-phase induction motor.
A 3 phase induction motors do not need a start winding or a Centrifugal switch as it has a RMF (rotate magnetic field). A RMF makes a 3 phase induction motor self-starting
A transformer can be used for reducing output voltage but also increasing the output voltage. But it’s only on AC. If connect a transformer to DC power supplier the transformer will be over heated
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