Fig. 3 shows one of the consumer circuits with three electrical appliances R, S and T, connected into the circuit. Using the current, voltage and resistance values shown on Fig. 8, calculate

a.the current at point X and at point Y, b.the resistance of appliance T, C.the combined resistance of appliances R and S, d.the power developed in appliance R, e.the energy converted by the appliances in 2 minutes (120 s).