TEST OF PRACTICAL KNOWLEDGE QUESTION Measure and record the e.m.f. of the accumulator provided. Connect a circuit as shown in the diagram. S is a standard r...

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TEST OF PRACTICAL KNOWLEDGE QUESTION


  1. Measure and record the e.m.f. of the accumulator provided.
  2. Connect a circuit as shown in the diagram. S is a standard resistor and R is a resistance box.
  3. With R = 0\(\Omega\), close the key K. Read and record the ammeter reading I. Evaluate 1\(^{-1}\).
  4. Repeat the procedure for R=1,2, 3, 4, and 5\(\Omega\). Tabulate your readings.
  5. Plot a graph of R on the vertical axis and 1\(^{-1}\) on the horizontal axis, starting both axis from the origin (0,0).
  6. Determine the slope s of the graph and find the intercept C on the vertical axis.
  7. State two precautions taken to ensure accurate results.

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

ii. A parallel combination of 3\(\Omega\) and 4\(\Omega\) resistors is connected in series with a resistor of 4\(\Omega\) and a battery of negligible internal resistance. Calculate the effective resistance in the circuit.

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