Basic Electricity Paper 3 , May/June 2014
 Questions: 1 2 Main
Weakness/Remedies
Strength

Question 2

AIM: To determine the equivalent resistance of a circuit.

1.   Connect the circuit as shown in Fig. 2.
2.   Ask the Supervisor to check the circuit connection.

Table 2

 Source voltage, Vs(V) Ammeter reading (mA) Voltmeter reading (V) 5 10 15 20 25

1.   Close switch S3.
2.   Adjust the source voltage, Vs to 5V.
3. Read and record in Table 2 the ammeter and voltmeter readings.
4. Open switch S3.
5. Repeat steps (d) to (g) by increasing the source voltage, Vs to 10 V, 15 V,

20 V and 25 V.

1. Plot a graph of V(V) on the vertical axis against I (mA) on the horizontal axis.
1.   Determine from the graph, the equivalent resistance of the circuit.
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Observation

The candidates were expected to connect the circuit as shown in Figure2, measure and record the expected ammeter and voltmeter readings. They were also to plot a graph and determine from the graph the equivalent resistance of the circuit.