How can you Convert a Galvanometer into a Voltmeter

Answer: A galvanometer is a gadget that detects extremely low currents. A galvanometer works on the idea that whenever an electric current is established in a conductor set in a constant magnetic field, it produces torque.

Voltmeter: A voltmeter is a gadget with high resistance. A perfect voltmeter has infinite resistance. It is transformed into a voltmeter by attaching a high resistance of appropriate value in sequence with the galvanometer. The voltmeter is placed in parallel to an electrical device that will be used to measure the potential difference.

By linking a high resistance in sequence with a galvanometer, it may be turned into a voltmeter. The volt scale is used to calibrate the scale. The amount of the series resistance measures the voltmeter’s range.

The resistance of a galvanometer = G.

To produce full size, you’ll need a lot of currents.

In the galvanometer, the deflection is equal to I_g.

Voltmeter range =V

Voltmeter resistance =R

Since R is connected in sequence with the galvanometer, the current flows through the galvanometer.

I_g = V/R+G

∴R= V/I_g – G​

The resistance to being connected in sequence with the galvanometer is determined from the equation.

The voltmeter’s effective resistance is R_v = G + R. R_v is really large. Thus it’s linked in parallel in the circuit to draw the least amount of current.

To put it another way, voltmeter resistance. When comparing the resistance over which the voltmeter is linked to detect the potential difference, it should be quite considerable. If not, the voltmeter will suck a lot of current from the circuit, lowering the current in the rest of it. In this situation, the voltmeter’s measurement of the potential difference is far smaller than the real potential difference.

Only if the voltmeter’s resistance is high is the mistake erased. A voltmeter with infinite resistance is an ideal voltmeter.