cameroon gce intermediate level 2025 electrical and electronic technology 2
cameroon gce intermediate level 2025 electrical and electronic technology 2
Section A: Electrical/Electronic Technology
Answer THREE (03) questions from this Section
1. The Automobile Battery
Figure 1 shows a cut-away view of an automobile lead-acid battery.
- a) Give the name as well as the functions of the numbered parts 1, 2, 3, 4 and 5. (2.5 marks)
- b) Give four (04) factors upon which the capacity of each cell depends on (2 marks)
- c) Define the following battery characteristics: 12V/45Ah/200A (1.5 marks)
- d) Battery sulphation.
- i) What is battery sulphation? (1 mark)
- ii) Give any TWO methods used to prevent battery sulphation. (1 mark)
- e) Apart from the (+) and (-) labellings on a battery’s terminals, what are the other methods of identifying battery terminals when not labelled? (1 mark)
- f) Briefly explain how you can activate a dry lead-acid battery. (1 mark)
SECTION B: ELECTRICAL/ELECTRONIC CALCULATIONS
Answer ANY TWO questions from this section.
1. ELECTRICITY AND ELECTRONIC PRINCIPLES
- a) Define the following:
- i) A conductor. (0.5 mark)
- ii) An insulator. (0.5 mark)
- iii) An electric current. (0.5 mark)
- b) Two resistors R1 and R2 of values 47Ω and 82Ω are connected in series across a 45V d.c battery.
- i) Draw a schematic diagram of this circuit with a voltmeter and an ammeter included. (1.5 marks)
- ii) Calculate the current (I) flowing in the circuit. (1.5 marks)
- iii) Calculate the voltage drops (Vd1) and (Vd2) across the resistors. (1.5 marks)
- iv) If the resistor R1 = 47Ω is replaced with a 39Ω resistor, will the current flowing in the circuit increase, decrease or remain the same? (1 mark)
- v) What will happen to the voltage drop across the 82Ω resistor? (1 mark)
- c) Give one disadvantage of the series circuit with regard to the wiring of a vehicle’s headlamps. (1 mark)
2. ELECTRIC CIRCUIT NETWORKS
- a) Name two types of electric circuits. (1.5 marks)
- b) There are three electrical units to Ohm’s law. Name the units. (1.5 marks)
- c) State Ohm’s law. (1 mark)
- d) A multimeter is used to test a circuit in a starter motor, the following readings were recorded: A current of 3.6A passed when a voltage of 7V was supplied. Calculate:
- i) The resistance of the circuit. (1 mark)
- ii) The power used in Watts (W). (1 mark)
- e) In the electrical circuit diagram shown in figure 6, the effective resistance of the circuit is 5.4Ω.
- Find:
- i) The resistance of R1 (1 mark)
- ii) The reading of the ammeter (A1) (1 mark)
- iii) The reading of the voltmeter (V1) (1 mark)
- iv) The reading of the ammeter (A2) (1 mark)
- Find:
