ABSTRACT
Find also the current flowing in each of the other two branches of the circuit. (27)
2 A d.c. voltage source has an internal resistance of 2 and an open circuit voltage of 24 V. State the value of load resistance that gives maximum power dissipation and determine the value of this power. (5)
3 A sinusoidal voltage has a mean value of 3.0 A. Determine it’s maximum and r.m.s. values. (4)
4 The instantaneous value of current in an a.c. circuit at any time t seconds is given by: i D 50 sin100t 0.45mA. Determine (a) the peak to peak current, the periodic time, the
frequency and the phase angle (in degrees) (b) the current when t D 0 (c) the current when t D 8 ms (d) the first time when the voltage is a maximum. Sketch the current for one cycle showing relevant points. (14)
