TEST OF PRACTICAL KNOWLEDGE QUESTION You are provided with two wires marked P and C. a resistor R\(_{s}\) = 1\(\Omega\) and other necessary apparatus. Conne...

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TEST OF PRACTICAL KNOWLEDGE QUESTION



You are provided with two wires marked P and C. a resistor R\(_{s}\) = 1\(\Omega\) and other necessary apparatus.

  1. Connect R\(_{s}\) in the left-hand gap of the metre bridge, a length L= 100cm of wire P in the right-hand gap and the other apparatus as shown in the diagram: above
  2. Determine the balance point B on the bridge wire AC
  3. Measure and record AB =/s, and BC = /
  4. Evaluate R\(_{1}\) = (\(\frac{|_{p}}{|_{s}}\))Rs
  5. Repeat the procedure for four other values of L = 90, 80, 70 and 60cm. In each case obtain and record the value of |\(_{s}\) and |\(_{p}\) and evaluate R\(_{1}\) = (\(\frac{|_{p}}{|_{s}}\))Rs
  6. Repeat the experiment with the second wire, Q. Obtain the value of |\(_{s}\) and |\(_{Q}\) for equal lengths of wire as used in wire P.
  7. Evaluate R\(_{1}\) = (\(\frac{|_{p}}{|_{s}}\))Rs. In each case, tabulate your readings.
  8. Plot a graph of R\(_{2}\) on the Vertical axis against R\(_{1}\) on the horizontal axis.
  9. Determine the slope S, of the graph.
  10. Evaluate the k = \(\sqrt s\).
  11. State two precautions taken to ensure accurate results.

(b)i. Define the resistivity of the material of a wire.

ii. A galvanometer with a full-scale-deflection of 1.5 x10\(^{3}\). A has a resistance of 50\(\Omega\). Determine the resistance required to convert it into a voltmeter reading up to 1.5V.

Current Electricity
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