The device used to measure potential difference between two points in volts is known as ____________.

Question

Question

This question was previously asked in

RRB ALP Instrument Mechanic 23 Jan 2019 Official Paper (Shift 1)

Answer 1

The correct answer is option 3, i.e. Voltmeter.

Concept:

Electric current is defined as the rate of flow of charge or electron, so its direction is the flow of positive charge.
The SI unit of the electricity is Ampere(A) and it is a scalar quantity.
Resistance is the opposition delivered by the conductor in which current flows through it.
A device that is used to measure electric current in a circuit is called an ammeter. The resistance of an ideal ammeter is always Zero and is always connected in the circuit in series.
A voltmeter is a device that is used to measure the potential difference between the two points in a circuit. The resistance of an ideal voltmeter is infinite.
A galvanometer is a device that is used to detect and measure small electric currents in any circuit. It can measure current up to 10-6 Ampere.
Now the interesting fact is:
- We can convert a Galvanometer into an ammeter by connecting a shunt parallel to it.
- A shunt is a small wire having very low resistance
- We can also convert a Galvanometer into a voltmeter by connecting a very high resistance in its series.