According to Figure P1-14 shows a single-phase ac power system with three loads. The voltage source is V = 240 ∠0° V and the impedances of these three loads are: Z1 = 10∠ 30° Ω; Z2 = 10∠ 45° Ω; Z3 = 10∠-90° Ω.

a) Assume that the switch shown in the figure is open and calculate the current I, power factor, real, reactive and apparent power supplied by the source.
b) How much real, reactive and apparent power is being consumed by each load with the switch open? 

c) Assume that the switch shown in the figure is closed and calculate the current I, power factor, real, reactive and apparent powers supplied by the source.
d) How much real, reactive and apparent power is consumed by each load with the switch closed? 

e) What happens to the current emanating from the source when the switch is closed? Why?

V FIGURA P1-14 Circuito del problema 1-19. + + +