AC test

(d) A 240V supply with a frequency of 50Hz causes a current of 3.0A to flow through an inductor of negligible ohmic resistance. Calculate: X (i) Reactance of the inductor. (3) TIME: 1:20 minutes Coil 1. (a) (i) Distinguish between root mean square value and peak value of an alternating current. (2) resistor of resistance 2.5. Find the power dissipated in the resistor and sketch a graph of voltage and current through the resistor on the same axes against time. (4 marks) (b)(i) Explain why a capacitor apparently conducts alternating current. (2) (ii)The instantaneous value of a sinusoidal alternating voltage is given by, V = 200sin60𝝅t volts. Calculate the r.m.s. voltage and the frequency. (4) S6 AC TEST 2. (a) (i) Define the term impedance and full wave rectification as applied to alternating current. (2 marks) (ii) A sinusoidal alternating current I = 3 sin (120𝜋𝑡) amperes flows through a “What Man Can Do, Man Can Do” pg. 1 (ii) Give two advantages of the moving iron meter over the moving coil meter. (2) (b) A coil of wire is connected in parallel with an electric bulb to a d.c source as shown in the figure below. bulb (ii) Draw a sketch graph showing the phase difference between applied p.d. and current for a pure capacitor a.c circuit. (1) Attempt Any Three Questions of Your Choice (ii) Inductance of the inductor. (2) K (c) (i)With the aid of a labelled diagram, describe how a repulsion – type moving iron meter operates. (4) (c) (i) Define the term reactance. (1 mark) 3. (