# Ohm Law definition

# Ohm law definition :

According to this law, current is going in a circuit is directly proportional to the potential difference applied across its ends provided that resistance of circuit remain constant.

Mathematically :

It is given as

V = constant I

V = R I

V= I R

**Explanation** :

If we now any two values of the voltage , current or resistance quantities. We use ohm law to find third missing value. Ohm law is largely used in electronic circuits and very important law of electricity.

**To find Voltage :**

when I and R are given

V = I R

**To find Current** :

When V and R are given

I = V/R

**To find Resistance :**

When V and I are given

R = V / I

**Ohm law Triangle :**

The triangle in which three quantities of ohm law as shown is called ohm law triangle.

**Explanation** :

Figure show ohm law Triangle in which voltage is shown at the top , current is shown at the left and the resistance is shown at right portion.

Figures 1, 2 , 3 show three formula of ohm's law to find voltage , current and resistance.

If we keep resistance constant then I increases with increase in voltage and voice versa. If we keep voltage constant then current will increase with decrease in resistence on voice versa.

## Ohm Law Graph **:**

The graph between voltage and current is called graphical representation of ohm law as given below :

ohm law graph |