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Current Electricity question

2002 · Shift 0 · Q165
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Current Electricity question

2002 · Shift 0 · Q165

JEE MainPhysicsCurrent ElectricityMCQ+4 / −1
If an ammeter is to be used in place of a voltmeter, then we must connect with the ammeter a
  1. A
    low resistance in parallel
  2. B
    high resistance in parallel
  3. C
    high resistance in series
  4. D
    low resistance in series
View written solutionFree

Correct answer: C

  1. Recall the basic properties

    • An ammeter is used to measure current, so it should have very low resistance.
    • A voltmeter is used to measure potential difference, so it should have very high resistance.

  2. What is needed to convert an ammeter into a voltmeter? To use an ammeter as a voltmeter, we must make the combination draw very little current from the circuit.

  3. How can this be done? Since the ammeter itself has low resistance, we must connect a high resistance in series with it.

  4. Reason

    • In series, the total resistance becomes large.
    • A voltmeter must be connected across two points, and it should have high resistance so that it does not disturb the circuit.
    • Therefore, an ammeter + high series resistance behaves like a voltmeter.

  5. Check options

    • A: low resistance in parallel — incorrect, total resistance remains low.
    • B: high resistance in parallel — incorrect, not the correct way to increase effective resistance for voltmeter use.
    • C: high resistance in series — correct.
    • D: low resistance in series — incorrect, resistance will still not be sufficiently high.

Hence, the correct answer is C.

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