ohms law class 10

 

OHM’S LAW

OHMS LAW:--

Ohms law provides relationship between the potential difference and current flowing through the metallic conductor in a circuit.

 

Ohms law states that , at a constant temperature , there is relationship between the current carrying conductor (I) , flowing through the metallic wire or conductor  and potential difference (V) is crossing through its terminal.

Now, in an electric circuit, the potential difference (V) , across the ends of the metallic wire is directly proportional to the current flowing through it. This is called ohms law.

Mathematically , this law can be expressed as follows:--

 

V    ∝    I

Or , I   ∝    V

V/I   =    constant

V/I   = R

Here R is the resistant.

SI unit of R is    (Ω)

(Ω) :-- Its represented by Greek letter. And also called as omega

 

According to ohms law,

R = V/I

 

 

1 OHMS is expressed as if the potential difference (PD) of a conductor is 1V and the current passing through the conductor is 1A , then the resistance of that conductor is to be:--

1 (Ω)    = 1volt / 1 Ampere

1 (Ω)     = 1V / 1A

 

 

In general , if the potential difference is constant. Current is inversely proportional to the Resistance.

 

I     ∝       1 /R

 

Then  R is doubled then I gets halved. And if the resistance (R) gets halved then the current is doubled.

 

 

Definition of Resistance :--

Resistance is the property of a conductor to resist the flow of charge through it.

 

 

Definition of Rheostat :--

 

It is a device which is used to change the Resistance in a electric circuit.