Question:
To convert a galvanometer into a voltmeter, one must connect a:
To convert a galvanometer into a voltmeter, one must connect a:
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Instrument Conversion:
Galvanometer → Voltmeter : High resistance in series
Galvanometer → Ammeter : Low resistance (shunt) in parallel
Updated On: Apr 28, 2026
- Low resistance in series
- High resistance in series
- Low resistance in parallel
- High resistance in parallel
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The Correct Option is B
Solution and Explanation
Concept:
A galvanometer is a sensitive instrument used to detect very small electric currents. However, it cannot directly measure large potential differences.
To convert a galvanometer into a voltmeter, it must be modified so that only a small current passes through it while measuring a potential difference across a circuit.
This is achieved by connecting a high resistance in series with the galvanometer.
Step 1: Understand the function of a voltmeter. A voltmeter measures the potential difference between two points and must draw very little current from the circuit.
Step 2: Introduce a high resistance. By connecting a large resistance $R$ in series with the galvanometer resistance $G$, the total resistance becomes very high. \[ V = I(G + R) \] Because the resistance is large, the current flowing through the instrument becomes very small, allowing safe measurement of voltage.
Step 3: Reason for series connection.
• Series connection increases total resistance.
• It limits the current flowing through the galvanometer.
• Thus, the device can measure potential difference without damage. Therefore, a galvanometer is converted into a voltmeter by connecting a high resistance in series.
Step 1: Understand the function of a voltmeter. A voltmeter measures the potential difference between two points and must draw very little current from the circuit.
Step 2: Introduce a high resistance. By connecting a large resistance $R$ in series with the galvanometer resistance $G$, the total resistance becomes very high. \[ V = I(G + R) \] Because the resistance is large, the current flowing through the instrument becomes very small, allowing safe measurement of voltage.
Step 3: Reason for series connection.
• Series connection increases total resistance.
• It limits the current flowing through the galvanometer.
• Thus, the device can measure potential difference without damage. Therefore, a galvanometer is converted into a voltmeter by connecting a high resistance in series.
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