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Current Electricity question

2020 · 6 Sep · Shift 2 · Q42
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Current Electricity question

2020 · 6 Sep · Shift 2 · Q42

JEE MainPhysicsCurrent ElectricityMCQ+4 / −1
A circuit to verify Ohm's law uses ammeter and voltmeter in series or parallel connected correctly to the resistor. In the circuit :
  1. A
    Ammeter is always connected in series and voltmeter in parallel
  2. B
    Both ammeter and voltmeter must be connected in series
  3. C
    Both ammeter and voltmeter must be connected in parallel
  4. D
    Ammeter is always used in parallel and voltmeter is series
View written solutionFree

Correct answer: A

  1. Recall the purpose of each instrument

    • Ammeter measures current through a circuit element.
    • Voltmeter measures potential difference across a circuit element.

  2. How an ammeter should be connected

    To measure the current through a resistor, the ammeter must carry the same current as the resistor.

    Therefore, it must be connected in series with the resistor.

    Also, an ideal ammeter has very small resistance, so series connection does not significantly disturb the circuit.

  3. How a voltmeter should be connected

    To measure the potential difference across the resistor, the voltmeter must be connected across the two ends of the resistor.

    Therefore, it must be connected in parallel with the resistor.

    Also, an ideal voltmeter has very large resistance, so it draws negligible current.

  4. Check each option

    • A: Ammeter is always connected in series and voltmeter in parallel.
      This is correct.

    • B: Both ammeter and voltmeter must be connected in series.
      This is incorrect.

    • C: Both ammeter and voltmeter must be connected in parallel.
      This is incorrect.

    • D: Ammeter is always used in parallel and voltmeter is series.
      This is incorrect.

  5. Final answer

    The correct option is: A\boxed{A}A​

  6. Comparison with stored answer

    Stored correct answer = A.
    My derived answer = A.
    So, they match.

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