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Q3. Three resistive loads of 50 Ω, 20 Ω and 30 Ω are connected respectively in star to the R, S and T phases of a three- phase, 4-wire, 415 V, power supply.

(a) Determine EACH of the following:

(i) The current in each load; (3)

(ii) The current in the neutral wire; (6)

(iii) The total power supplied to the load. (3)

(b)Sketch, approximately to scale, the phasor diagram of the load and neutral currents. (4)