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To convert the given galvanometer of known resistance and figure of merit into a voltmeter of desired range and to verify the same
CONVERSION OF GALVANOMETER INTO VOLTMETER
A galvanometer is an electronic device that is used to detect mild currents in an electrical circuit. Galvanometer works on the principle of a coil placed in a uniform magnetic field that experiences a torque when an electric current is set up in it We can convert a galvanometer into a voltmeter by connecting a large resistance in series to the galvanometer.
Aim of the experiment :
To convert the given galvanometer into a voltmeter of the required range (0 - 3V) and verify the same.
Apparatus required :
- Connecting wire
- Galvanometer
- Battery
- Voltmeter
- Resistance box
- Plug Key
- Rheostat
Principle of the experiment :
Galvanometer can be converted into a voltmeter by connecting suitable high resistance in series with it so that a very small current flows through the galvanometer
Formula :
Circuit diagram :
The circuit diagram for converting the given galvanometer of known resistance and figure of merit into a voltmeter is as follows below :
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Conversion of Galvanometer into voltmeter |
Procedure :
- The value of resistance is calculated using the formula, R = V / Ig - G
- The circuit connections are made as shown in the circuit diagram.
- The calculated high resistance, R is unplugged in the standard resistance box and the rheostat is adjusted so that the voltage shown in the voltmeter is equal to the desired range (say 3V).
- Resistance from the resistance box is adjusted such that the galvanometer shows full-scale deflection. Then R' from the resistance box is noted.
- P' is equal or nearly equal to R. Hence conversion is verified.
Observation :
- Resistance of the galvanometer, G (given) = ..................................Ω ohm.
- Figure of merit of the galvanometer, K (given) = ..................................A/div.
- Number of divisions on either side of zero of the galvanometer scale, N = ..................................A.
- Current required for producing full-scale deflection of N divisions, Ig = N*K = ..................................Ampere
- Maximum voltage to be measured, V (say 3V) = ..................................V.
Calculation :
High resistance to be connected in series with the galvanometer, R = V / Ig - G
Result :
01. The value of the theoretically calculated value of series resistance, R = ..................................Ω ohm.
02. Practically observed value of series resistance, R' = ..................................Ω ohm.
Note :
High resistance of order of 10K should be unplugged in the resistance box first and then key has to be closed to avoid any damage to the galvanometer.
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