[Solved] What Does The Voltmeter Measure?

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Question

Download Solution PDFWhat does the voltmeter measure? This question was previously asked in ALP CBT 2 Electrician Previous Paper: Held on 23 Jan 2019 Shift 2 Download PDF Attempt Online View all RRB ALP Papers >
  1. Strength of current
  2. Voltage
  3. Resistance
  4. Energy consumed

Answer (Detailed Solution Below)

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Detailed Solution

Download Solution PDF

CONCEPT:

Ammeter:

  • An ammeter is an instrument which is used to measure the current flowing through the circuit.
  • It has low resistance, ideally zero.
  • By connecting ammeter in series, it allows all of the circuit current to pass through it and hence measure it.

Voltmeter:

  • A voltmeter is an instrument which is used to measure the voltage across two terminals in a circuit.
  • Voltmeter ideally has infinite resistance.
  • Connecting voltmeter with infinite resistance in parallel ensures no current flows through the voltmeter and the voltage drop (IR) remains the same.
  • Hence, the ammeter should be connected in series and voltmeter in parallel.

EXPLANATION:

Instrument

Measured quantity

Ammeter

Current (A)

Ohmmeter

Resistance (Ω )

Voltmeter

Voltage (V)

Energy meter

Energy (Kwh)
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