Question

How to find potential difference between two points in a circuit?

Answer 1

Answer:

The unit of potential difference generated between two points is called the Volt and is generally defined as being the potential difference dropped across a fixed resistance of one ohm with a current of one ampere flowing through it. In other words, 1 Volt equals 1 Ampere times 1 Ohm, or commonly V = I*R.

Answer 2

Potential difference between two points in circuit is the energy lost by the charge in being transferred from one point to another. For example, potential difference between A and B is found with following formula;

VAB=VB-VA=∑ε-∑i.R

This formula shows the energy lost by charge moving from point A to point B.

We should first find the direction of the current to determine values ∑ε and ∑i.R. If you take the sign of batteries having same direction with current as “+” then you must take oppositely connected batteries as “-“.

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