Physics 9702: ALTERNATING CURRENTS Topical Past Paper Questions

(a) (i) State what is meant by half-wave rectification of an alternating current. [2] (ii) Figure 7.1 shows an incomplete diagram of the circuit used to achieve half-wave rectification of an alternating input voltage $ V_{IN} $ to produce output voltage $ V_{OUT} $. Figure 7.1 Co…

Fig. 6.1 shows part of a bridge rectifier circuit that can be used for rectification of an alternating input voltage $ V_{IN} $. Fig. 6.1 The circuit contains four diodes, one of which is shown. The rectified output voltage $ V_{OUT} $ is applied across load resistor R. (a) (i) S…

(a) State what is meant by the frequency of an alternating current. [1] (b) An alternating current $ I $ in a resistor of resistance $ 680\Omega $ varies with time $ t $ according to $$ I=3.5\sin{(40\pi t)} $$ where I is in A and t is in s. (i) Show that the period of the alterna…