cameroon gce intermediate level 2024 electrical and electronic circuits 2

cameroon gce intermediate level 2024 electrical and electronic circuits 2

cameroon gce intermediate level 2024 electrical and electronic circuits 2

SECTION A: ELECTRICAL CIRCUIT
A resistance of R = 2140, an inductance of L = 0.2H and a capacitor of C = 14.468pF are connected in
of frequency f = 50Hz and an r.m.s value of V– 230V.
1)
series across an ac source
a) Draw the diagram of the circuit described.
b) Determine:
(2.5 marks)

(5 marks) (5 marks)

The impedance of the circuit. The current in the circuit.

The duration (in seconds) that the waveform of the supply will take to make a complete cycle.
(5 marks)
i)
ii)
iii)
iv) The phase angle between the current and the voltage (2.5 marks)
c) Suppose that the inductance is replaced with an inductance of L = 0.7H

i)	Compare the new impedance with die value of the resistance and state what happens to the
circuit Determine die frequency at this condition.	(5 marks) (5 marks)	ii)

Figure 1
Figure 1 show‘s a serie– parallel connection of capacitors Cl, C2 and C3 to a source Vs.
Given diat Cl = 5pF, C2 = 3 pF, C3 = 1 pF and Vs = 10V,
Determine:
a) The equivalent capacitance of the circuit.
b) The value of VI and V2.
c) The charge stored by each capacitor.
d) The total charge stored.
e) The energy stored by

c) Nine batteries of 12V, 200AH each supply a 36V dc load:
Give the connection diagram showing how these batteries ought to be connected to produce
the desired load voltage of 36V.
i)
(6 marks)
Calculate the total resistance of the circuit considering a load resistance of 10Q and that the
battery has an internal resistance of 0.5Q.
What is the value of the total internal resistance of the source?
ii)
(8 marks)
iii) (3 marks)

Given the logic circuit of figure 2
a) Identify the logic gates labelled 1, 2, and 3.
b) Give the Boolean expression of the circuit.
c) Establish the truth table of the Boolean expression.
d) Draw the equivalent electric circuit.