What is Voltmeter and How Voltmeter Works?

This post is all about voltmeter or voltage meter. We will discuss about the voltmeter completely basic in this post. Well, Voltmeter is a voltage meter. Which measures the voltage between the two nodes. We know the unit of potential difference is volts. So it is a measuring instrument which measures the potential difference between the two points.

A Voltmeter is a measuring instrument which measures the voltage between the two nodes in an electric circuit. In analog voltmeters the pointer moves across a scale in proportional to the voltage of the circuit. Digital voltmeters have a numerical display of voltage by using an analog to digital converter.

Principle of Voltmeter

Let's discuss the principle of voltmeter. The main principle of voltmeter is that it must be connected in parallel in which we want to measure the voltage. As we know that, Parallel connection is used because a voltmeter is constructed in such a way that it has a very high value of resistance. So if that high resistance is connected in series than the current flow will be almost zero which means the circuit has become open. This is why, a voltmeter or a voltage meter always connected in parallel with the load.

Also in parallel circuit we know that the voltage is same so the voltage between the voltmeter and the load is almost same and hence voltmeter measures the voltage. Now, I do not want to write that we have these types of voltmeter because it is not very important as respect to basic learnings. But, just remember that, there is a different meter/funtion to check DC voltage and AC voltage.