TEST OF PRACTICAL KNOWLEDGE QUESTION You have been provided with a resistance box, a voltmeter, a key, a battery, and other necessary materials. Connect the...

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TEST OF PRACTICAL KNOWLEDGE QUESTION


You have been provided with a resistance box, a voltmeter, a key, a battery, and other necessary materials.

  • Connect the circuit as shown in the diagram above.
  • With the key K closed, read and record the voltmeter reading V\(_{0}\).
  • Set the resistance R in the resistance box equal to I\(\Omega\).
  •  Close the key, read and record the potential difference V on the voltmeter.
  • EvaluateR\(^{-1}\) and V\(^{-1}\) .
  • Repeat the procedure for five other values or R = 2\(\Omega\), 3\(\Omega\), 4\(\Omega\), 5\(\Omega\) and 6\(\Omega\).
  • Tabulate your readings.
  • Plot a graph with V\(^{-1}\) on the vertical axis and R on the horizontal axis.
  • Determine the slope, s, of the graph and the intercept, C, on the vertical axis.
  • Evaluate c\(^{-1}\)
  • State two precautions taken to obtain accurate results.

(b)i. Define the potential difference between two points in an electric circuit.

ii. Explain why the emf of a cell is greater than the p.d. across the call when it is supplying Current through an external resistance.

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