conversion galvanometer into voltmeter??
Answers
Answer:
A galvanometer can be converted into a voltmeter by connecting a large resistance in series to the galvanometer which is shown in diagram. Let G and R be the resistance of a galvanometer and a conductor connected in series with it respectively
A galvanometer can be converted in to a voltmeter by connecting a high resistance in series with it.
Explanation:
The scale is calibrated in volt. The value of the resistance connected in series decides the range of the voltmeter.
Galvanometer resistance =G
The current required to produce full scale Deflection in the galvanometer =Ig
Range of voltmeters =V
Resistance of voltmeter =R
Since R is connected in series with the galvanometer, the current through the galvanometer,
Ig=R+GV
∴ R=V/Ig −G
The resistance is calculated by this equation which is connected in series. The effective resistance of the voltmeter is Rv=G+R. Rv is very large and hence a voltmeter is connected in parallel in a circuit as it draws the least current from the circuit.