Advertisement Remove all ads

# Ohm’s Law

Advertisement Remove all ads

#### notes

OHM’S LAW:-

Ohm’s Law states that the potential difference between two points is directly proportional to the electric current.

V I

Or V/I=R        . . .1

Or 1/I=R/V

Or I=V/R        . . .2

Or V=IR          . . .3

Where R is constant for the given conductor at a given temperature and called resistance. Resistance is the property of conductor which resists the flow of electric current through it.

SI Unit:-

SI unit of resistance is ohm. Ohm is denoted by Greek letter ‘Ω’.

R = "V"/"I"

If the potential difference across the two ends of a conductor is 1 V and the current through it is 1 A, then the resistance R, of the conductor is 1 Ω. That is,

1 ohm = (1 "Volt")/ (1"Ampere")

I = "V"/"R"

-It is obvious that the current through a resistor is inversely proportional to its resistance. If the resistance is doubled the current gets halved. In many practical cases it is necessary to increase or decrease the current in an electric circuit.

-A component used to regulate current without changing the voltage source is called variable resistance.

-In an electric circuit, a device called rheostat is often used to change the resistance in the circuit.

If you would like to contribute notes or other learning material, please submit them using the button below.

#### Video Tutorials

We have provided more than 1 series of video tutorials for some topics to help you get a better understanding of the topic.

Series 1

Series 2

Series 3

### Shaalaa.com

Electricity part 5 (Ohms Law & resistivity) [00:10:41]
S
##### Series: series 3
0%

Advertisement Remove all ads
Share
Notifications

View all notifications

Forgot password?