cameroon gce intermediate level 2025 electronic circuits 2
cameroon gce intermediate level 2025 electronic circuits 2
SECTION A: ANALOGUE ELECTRONICS
Answer question one and any two questions
1. CIRCUIT ANALYSIS
The circuit parameters of the circuit in figure 1 are E1=20V, E2=40V, E3=10V, R1=4$\Omega$, and R2=R3=8$\Omega$.
Figure 1
1.1 State milman’s theorem. (3 marks)
1.2 Calculate the value of the Thevenin’s equivalent voltage seen to the left of A-B terminals. (7 marks)
1.3 Calculate the value of the Thevenin’s equivalent resistance seen to the left of A-B terminals. (6 marks)
1.4 Deduce the value of RL required for maximum power to be transferred to the load. (3 marks)
1.5 Calculate the maximum load power. (6 marks)
(Total = 25 marks)
2. DIODE CIRCUIT
Figure 2 shows a diode circuit. The values of the circuit elements are E=15V; R1=100$\Omega$; R2=50$\Omega$; R3=22$\Omega$; the barrier potential of the diodes is 0.6V.
Figure 2
2.1 Draw the equivalent model of the diode when it is forward biased. (4 marks)
2.2 If the two diodes are conducting, find:
2.2.1 the voltage V3, (2 marks)
2.2.2 the voltage V1, (2 marks)
2.2.3 the values of the currents I3 and I2. (5 marks)
2.2.4 the values of the currents I1 and I4. (6 marks)
2.3 If E = -10V,
2.3.1 What is the state of the diodes? (4 marks)
2.3.2 Calculate the values of the currents I2 and I. (4 marks)
(Total = 25 marks)
