Exam Question

(a) Explain what is meant by the terms wave form, frequency and average value. (6)

(b) A moving coil ammeter, a thermal ammeter and a rectifier are connected in series with a resistor across a 110 V sinusoidal a.c. supply. The circuit has a resistance of 50 Ω to current in one direction and, due to the rectifier, an infinite resistance to current in the reverse direction. Calculate: (10)

(i) The readings on the ammeters

(ii) The form and peak factors of the current wave.