## Ohm's law

In our previous post, we discussed about the resistance. Today we are about to study the Ohm's law.

Whenever electric current flows through a conductor , the following factors are present :

- The potential difference V across the conductor causing the current to flow.
- The opposition or resistance R of the conductor which must be overcome.
- The current I which in the conductor as a result of pressure overcoming the resistance.

Ohm's law:

The voltage difference across a conductor is directly proportional to the current which goes through it due to the voltage difference , provided the temperature of the conductor does not change.

or

The ratio of potential difference V between any two points of a conductor to the current I flowing between them is constant, provided the temperature of the conductor does not change.

Mathematically,

V/I = constant

or

V/I = R

where R is the resistance of the conductor between the considered points.

This can be written as,

**V = IR**

This law is applicable to both DC and AC circuits. But it is complicated than DC .

### Derived relations from Ohm's law

- Power is given by the product of voltage and current.
**W = VI**Using ohm's law we can rewrite this equation as,W = I^{2}RW = V^{2}/R

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