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Question
RRB NTPC - 2019
General Science

The instrument used to measure current is called ______.

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper PDF (31-Jan-2021) (Shift 1)
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The correct answer is
Ammeter

Instrument Used to Measure Electric Current

Electric current is the flow of electric charge. To measure this flow rate in a circuit, a specific instrument is required.

The instrument specifically designed and used to measure electric current is called an ammeter.

Understanding the Options

  • Ammeter: Correct. Measures electric current (in Amperes). It is connected in series with the circuit component through which the current is to be measured.
  • Voltmeter: Incorrect. Measures electric potential difference or voltage (in Volts). It is connected in parallel across the component.
  • Battery: Incorrect. A battery is a source of electrical energy, not a measuring instrument.
  • Meter: Incorrect. This is a general term for any measuring instrument. While an ammeter is a type of meter, "ammeter" is the specific and correct term for measuring current.

Therefore, the correct instrument for measuring current is the ammeter.

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