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GK QUESTION#2968

Statement I: A rheostat is used to change the resistance in an electric circuit without interrupting the flow of current. Statement II: An ammeter is used to measure the voltage across two points in a circuit. Which of the following is correct?

  1. AOnly Statement I is correctCorrect answer
  2. BOnly Statement II is correct
  3. CBoth Statement I and Statement II are correct
  4. DBoth Statement I and Statement II are incorrect
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Answer

A. Only Statement I is correct

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Explanation

A rheostat varies circuit resistance and hence current. An ammeter measures current, not potential difference; a voltmeter measures potential difference. Only Statement I is correct.

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