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