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Electricity — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceElectricity5 Marks
Question
When a high resistance voltmeter is connected directly across a resister its reading is 2V. An electric cell is sending the current of 0.4 A, (measured by an ammeter) in the electric circuit
in which a rheostat is also connected to vary the current.
  1. Draw an equivalent labelled circuit for the given data.
  2. Find the resistance of the resister.
  3. Name and state the law applicable in the given case. A graph is drawn between a set of values of potential difference (v) across the resister and current (I) flowing through it.
Show nature of graph thus obtained.
✓

Answer

  1. .​
  2. Voltmeter reading shows, V = 2 V
Since, $\text{R} =\frac {\text{V}}{\text{I}} = \frac{2}{0.4}=5\Omega$
  1. The law applicable here is the Ohm’s law.
Ohm’s law states that the current flowing through a conductor is directly proportional to the potential difference across the conductor. The proportionality constant is the

resistance of the conductor, it is a constant for a known temperature range.



The graph obtained is a straight line with positive slope.

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