Determine the power input of ac motor, Physics

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A 415V 3-phase a.c. motor has a power output of 12.75kW and operates at a power factor of 0.77 lagging and with an ef?ciency of 85%.

If the motor is delta-connected, verify

(a) the power input,

(b) the line current and

(c) the phase current.

 


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