A star delta starter is used to control a three phase motor. The line conductors from the starter to the motor are wired in 4mm copper conductors and have a resistance of 87.5m0.

A load consisting of three identical coils with resistance of 11Ohms and inductance of 50mH are connected (i) in star, and (ii) then in delta to a 400v 50hz 3 phase supply. Determine the total power dissipated in each case.

You must use the Xl=2 π fl formula.
Ps= √3 x Vl x Il x Coso

 

A star delta starter is used to control a three phase motor. The line conductors from the starter to the motor are wired in 4mm copper conductors and have a resistance of 87.5m0.

A load consisting of three identical coils with resistance of 11Ohms and inductance of 50mH are connected (i) in star, and (ii) then in delta to a 400v 50hz 3 phase supply. Determine the total power dissipated in each case.

You must use the Xl=2 π fl formula.
Ps= √3 x Vl x Il x Coso

You need to show us what you have done so far so that we know where the problem is. How about starting with an accurate drawing of each setup.