TEST OF PRACTICAL KNOWLEDGE QUESTION You are provided with a potentiometer, an ammeter, a voltmeter, a standard resistor, and other necessary apparatus. Usi...

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TEST OF PRACTICAL KNOWLEDGE QUESTION



You are provided with a potentiometer, an ammeter, a voltmeter, a standard resistor, and other necessary apparatus. Using the circuit diagram above as a guide carry out the following instructions.

  1. Set up a circuit as illustrated in the diagram above.
  2. Close the key, K.
  3. Read and record the ammeter reading l\(_{o}\) and the voltmeter reading V\(_{o}\) when jockey J is not making contact with the potentiometer wire OQ.
  4. Using J, make a contact with the potentiometer wire OQ at a point P such that OP = 1Ocm.
  5. Read and record the current and the corresponding value of the voltage V.
  6. Repeat the procedure for other values of OP= 20cm, 30cm, 40cm, 50cm, and 60cm.
  7. Tabulate your readings.
  8. Plot a graph with V on the vertical axis and I on the horizontal axis, starting both axes from the origin (0, 0).
  9. Determine the slope, s, of the graph.
  10. Determine the value of V when I = 0.
  11. State two precautions taken to obtain accurate results.

(b) i. State two advantages of a lead-acid accumulator over a dry Leclanche cell.

ii. A cell of emf 2V and internal resistance of 1\(\Omega\) passes current through an external load of 9\(\Omega\). Calculate the potential drop across the cell.

Current Electricity
Capacitors
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