Ohm's Law Class 10

Ohm's law

Ohm's law shows the relationship between the voltage (V), Current (I) and resistance (R)


Who gave ohm's law?

 Georg Simon Ohm, a German physicist invented ohm's law


What is the definition of ohm's law?
Or
State ohm's law 

Ohm's law states that the current passing through a conductor is directly proportional to the potential difference across its ends.

If I is the current flowing through a conductor, when the potential difference across its end is V then

V∝I or I∝V

⇒V=IR.


What is the application of ohm's law?
or 
what is the main advantage of ohm's law ?

The main advantage of ohm's law is to determine either voltage, current or resistance when we know the values of other two.


What are the limitations of ohm's law?

 The law is not applicable to unilateral networks such as diode, transistor etc.

 This law is not applicable to non linear elements.

 This law is only true, when the temperature and other physical factors remain constant.


Graph of ohm's law

The graph between current I and voltage V is is straight line passing through the origin.

 The relationship between I-V is linear.

 The current voltage graph of ohmic devices is of the form of linear curve.


Which devices follows ohm's law?

 The devices which follows ohm's are known as ohmic devices. for example:- wire 



Which devices do not follow ohm's law?

 The device which do not follow ohm's law are known as non- ohmic devices. for example:- diode.



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