In a circuit, voltmeter is always connected in ______?

Question

Question

This question was previously asked in

Official Soldier Technical Paper : [Danapur] - 1 Nov 2020

Answer 1

CONCEPT:

Potential difference: The amount of work done to bring a unit positive charge from one point to another is called the potential difference.
- Its unit is volt.
- To flow current between two points, there should be some potential difference between them.
- Potential difference is provided by a cell or its combination called a battery.
Ohms Law: Potential difference at constant temperature is directly proportional to current.

V = IR

V is the potential difference between two points, I current, R is the resistance between two points.

Resistance: The property to resist electric current is called resistance. Its unit is Ω.
Voltmeter: The device used to measure the potential difference between two points in the circuit is called a voltmeter.

Series Connection	Parallel Connection
In a series connection, devices are connected such that the same current is passing through them.	In a parallel connection, devices are connected such that the same potential difference is applied across them.
The potential difference across different devices connected in series will be different.	The current passing through the different devices connected in parallel is different.

EXPLANATION:

The devices connected in parallel have the same potential difference across them.
So, in order to calculate the potential difference across a device, the voltmeter must be connected in parallel.
So, the parallel is the correct answer.

Important Points

An ammeter is a device used to measure current. Since the current is the same in series connection, so, the ammeter is connected in series.
In order to make sure, readings are not affected, the voltmeter is having very high resistance, and ammeters are having very low resistance.