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Applied Electricity 1, Nov/Dec 2009  
Questions:   1 2   Main
General Comments
Weakness/Remedies
Strength
































































Question 1

  1. Connect the circuit as shown in Fig.2.
  2. Ask the Supervisor to check the circuit.
  3. Copy Table 2 into your answer booklet.

 

Voltage Reading (V)

Ammeter Reading (mA)

0

 

2

 

4

 

6

 

8

 

10

 

12

 

                                 Table 2

  1. Adjust the variable power supply to read 0 V on the voltmeter.
  2. Close switch S.
  3. Read and record in Table 2 the corresponding ammeter reading.
  4. Repeat steps (d) and (f) for voltage values as indicated in Table 2.
  5. Plot a graph of voltage (V) on the vertical axis against current (I) on the horizontal axis.
  6. Calculate the slope of the graph.
  7. Comment on the shape of the graph.
  8. Compare the values of I in Table 1 with values of I in Table 2.
_____________________________________________________________________________________________________
Observation

The candidates were required to

  1. connect the circuit as shown and obtain current readings;
  2. calculate the slope of the graph and comment on the shape of the graph;
  3. compare the values of I in Table 1 with values of I in Table 2.

The  expected answers were:

Voltage Reading (V)

Ammeter Reading (mA)

0

0.000

2

333.300

4

666.600

6

1000.000

8

1333.300

10

1666.700

12

2000.000

The candidates connected the two lamps correctly in parallel and obtained readings of the current. However, most of the readings were not correct due to their inability to read correctly the measuring instruments, thus taking a toll on the table obtained for the experiment.

 

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