how to remove zero error in ammeter as well as voltmeter
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Zero error:
If the pointer of the ammeter or voltmeter is exactly at zero, when it is not connected to the circuit, then the instrument has zero error. If the pointer is above the zero mark, the the zero error is negative. The number of divisions it is above the zero mark are to be subtracted from the reading.
That is, the Final reading = Reading on the instrument, when connected in circuit - Zero error
If the pointer is below the zero mark, the zero error is positive.
That is, the Final reading = Reading on the instrument, when connected in circuit + Zero error
Least count:
If a voltmeter has 20 divisions between 0 mark and 0.5 V mark, then its
Least count = Minimum measure of unit between two marks / Number of divisions
= 0.5/20
= 0.025 V or 25 mV
In a similar way least count of ammeter is calculated.
If the pointer of the ammeter or voltmeter is exactly at zero, when it is not connected to the circuit, then the instrument has zero error. If the pointer is above the zero mark, the the zero error is negative. The number of divisions it is above the zero mark are to be subtracted from the reading.
That is, the Final reading = Reading on the instrument, when connected in circuit - Zero error
If the pointer is below the zero mark, the zero error is positive.
That is, the Final reading = Reading on the instrument, when connected in circuit + Zero error
Least count:
If a voltmeter has 20 divisions between 0 mark and 0.5 V mark, then its
Least count = Minimum measure of unit between two marks / Number of divisions
= 0.5/20
= 0.025 V or 25 mV
In a similar way least count of ammeter is calculated.
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