Question 2
- Table 2 contains types of diodes, their symbols and applications.
Table 2
S/N |
Type of Diode |
Symbol |
Application |
I |
Light Emitting diode |
|
Indicator light |
II |
|
|
Rectifier circuit |
III |
|
|
Counter circuit |
IV |
|
|
|
V |
Varactor diode |
|
|
VI |
Zener diode |
|
|
- Fig. 1 is the diagram of a resistive circuit.
Calculate the total:
- Resistance of the circuit;
- Current, I, flowing through the circuit.
Observation
The expected responses were:
Table 2
- (a)
S/N |
Type of Diode |
Symbol |
Application |
I |
Light Emitting diode |
|
Indicator light |
II |
Crystal diode |
|
Rectifier circuit |
III |
Photo diode |
|
Counter circuit |
IV |
Tunnel diode |
|
|
V |
Varactor diode |
|
|
VI |
Zener diode |
|
|
(b)
- Effective resistance of the three 2Ω resistors connected in parallel
Total resistance (RT) = 
According to the Chief Examiner, candidates that attempted question 2 did very well.