cameroon gce intermediate level 2025 electrical and electronic circuits 2
cameroon gce intermediate level 2025 electrical and electronic circuits 2
SECTION A
ELECTRICAL CIRCUITS
FIG. 1
Figure 1 shows an R LC parallel circuit. Given that R = 25$\Omega$, L = 0.12H and C = 120$\mu$F.
Calculate:
a) the inductive and capacitive reactance XL and XC. (4 marks)
b) the branch currents (IR, IL and IC). (6 marks)
c) the supply current. (4 marks)
d) the circuit impedance. (4 marks)
e) the power factor of the circuit and say whether it is leading or lagging. (4 marks)
f) the Q – factor. (4 marks)
g) the resonance frequency of the circuit. (4 marks)
FIG. 2
Using Thevenin theorem in figure 2:
a) Calculate the Thevenin resistance RTH seen from point AB if R is considered as the load (6 marks)
b) Calculate the Thevenin voltage VTH seen from point AB if R is considered as the load (5 marks)
c) Draw the Thevenin equivalent circuit indicating the VTH and RTH (5 marks)
d) Determine the current passing through the resistance R (4 marks)
e) Calculate the voltage between A and B (5 marks)
f) What will be the value of R for maximum power transfer (4 marks)
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