Atlearner-
April 19, 2023

March 18, 2023

If you are a little bit confused by the definition, then let's look at the hydraulic or heat analogy to understand it better -

The difference in water level makes water pressure for which the water flows from one tank to other. If we continue these analogies we see the current is similar to water flow, where water pressure indicates the voltage or electrical potential difference.

Here the temperature difference makes the heat flow from the hotter object to the cooler one. If we continue these analogies we see the current is similar to heat flow, where the temperature difference between the objects indicates the voltage or electrical potential difference.

Similarly, if two charged objects have a potential difference and are connected by a conductor, a positive charge flows from the higher potential object to the lower one. This charge flow from conductor to conductor does not depend on the total charge of the two conductors.

It depends on the electrical condition of the two conductors. This electrical state of the object is called electrical potential or voltage.

So, voltage is the state of two charged objects having a potential difference that indicates the flow of charge from one object to another when they are connected to each other.

The amount of work required to move a single positive charge from one point to another in an electric field is a measure of the potential difference.

If we symbolized voltage as *V*, work done as *W*, and charge as *q*, then the voltage

We find the voltage, current, and resistance relationship from **Ohm's law**. From this law, we find a mathematical representation of voltage as follows

Where *V* is the voltage, *I* is the current and *R* is the resistance.

Voltage is also related to power and current and the relationship is as follows

Now let's know about the SI and CGS unit of voltage.

1 statvolt is equal to 299.792458 volts.

There is a difference between EMF and voltage -

One of the major differences is voltage causes current to flow between two points where EMF is the energy supplied to the charge.

EMF maintains the potential difference or voltage between two electrodes i.e EMF has constant intensity with a higher magnitude where the intensity of voltage is lower than EMF and it is non-constant.

The EMF on any source is measured by using a potentiometer where the voltage in an electric circuit is measured by a voltmeter. Read More...

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