A resistive load is supplied with variable voltage d.c. from a triac full-wave rectifier bridge combination connected to an a.c. supply. draw the circuit diagram and, with the aid of voltage waveform sketches, calculate the load power dissipation for load resistance of 1000, a voltage supply of 110v at 50hz, and firing angle delays of 45°, and (b) 135°. assume ideal switching devices.​