$X_L = 38 \Omega$
$X_C = 31.8 \Omega$
$R = 20 \Omega$
If the system above has a supply voltage of 250 V/50 Hz, calculate:
3.1 The value of the inductor in mH
(3)
3.2 The value of the capacitor in µF
(3)
3.3 The impedance in ohms
(4)
3.4 The supply current in amps
(3)
3.5 The angle between the current and voltage
(3)
3.6 The voltage drop across the inductor and capacitor respectively
(4)
[20]
QUESTION 4: SEMICONDUCTOR PHYSICS, DIODES AND TRANSISTORS
4.1 Define the term semiconductor.
(2)
4.2 Draw a fully labelled half-wave rectifier circuit using a transformer, a diode, a
smoothing capacitor and a load resistor.
(4)
4.3 Explain the operation of the half wave circuit drawn in QUESTION 4.2.
(4)
4.4 A transistor can be used as an amplifier.
Explain, with the aid of a diagram, the operating principle of the amplification.
(7)