Why galvanometer is converted to voltmeter?

Why galvanometer is converted to voltmeter?

To convert a moving coil galvanometer to a voltmeter, we add a high series resistance, but why?. The high resistance causes most of the voltage to drop across it, leaving a small voltage drop across the galvanometer. This also ends up making the voltmeter have very high resistance.

How do you convert a galvanometer into an ammeter and a voltmeter?

1 Answer

1. A galvanometer is converted into a voltmeter by connecting a high resistance ‘R’ in series with it.
2. A galvanometer is converted into an ammeter by connecting a small resistance (called shunt) in parallel with it.
3. Resistance of voltmeter, RV = G + R.

How do we convert a galvanometer to ammeter and voltmeter and give its expression for current and voltage?

A galvanometer is converted into an ammeter by connecting a low resistance in parallel with the galvanometer. This low resistance is called shunt resistance S. The scale is now calibrated in ampere and the range of ammeter depends on the values of the shunt resistance.

How do you convert an ammeter to a voltmeter?

Converting an ammeter to a voltmeter involves increasing the resistance of the ammeter. This is done by adding a high resistance in series with the ammeter. Let the range of the ammeter be 0 – I0 Amp and we convert it to a voltmeter of range 0 – V0 volt.

How can you convert a galvanometer into an ammeter and voltmeter explain with diagram?

A galvanometer can be converted into ammeter by connecting a low resistance called shunt in parallel to the galvanometer. A voltmeter is a device used to measure the potential difference between two points in a circuit.

Why is it necessary to convert a galvanometer to voltmeter why not use a galvanometer directly instead?

Since Galvanometer is a very sensitive device. If a low value of current pass through the galvanometer, then it may burn of explode. Therefore, it is converted into voltmeter by connecting the coil of the galvanometer with a low resistance in parallel combination ammeter is made.

Can you measure EMF of a cell with a voltmeter?

The electromotive force (emf) of a cell is its terminal voltage when no current is flowing through it. A voltmeter cannot be used to measure the emf of a cell because a voltmeter draws some current from the cell.