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Galvanometer |
Ammeter |
Voltmeter |
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It is an instrument used to detect the flow of current in the circuit. |
It is an instrument used to show the amount of curren t in the circuit. |
It is an instrument used to show the amount of potential difference across two points in the circuit. |
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It tells the direction of current in the circuit. |
It doesn’t tell about the direction of current in the circuit. |
It tells nothing about the current in the circuit. |
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It is connected in series in a circuit. |
It is connected in series in a circuit. |
It is connected in parallel in a circuit. |
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It has moderate resistance (10-100 ohms) |
An ideal ammeter should have zero resistance, hence resistance of an ammeter is very small. |
An ideal voltmeter should have infinite resistance, hence resistance of a voltmeter is very high. |
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Magnetic Field is required for Galvanometer to work |
Ammeter can work with or without magnetic field |
Voltmeter can work with or without magnetic field |
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It measures only direct current |
It measures both direct and alternating current |
It tells nothing about current in the circuit |
