Question

State ohm's law and give its relation

Answer 1

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Ohm's law:-

☛ According to ohm's law, At constant temperature, the current flowing through a conductor is directly proportional to the potential difference across it's ends.

☛ If I is the current flowing through a conductor and V is the potential difference (or voltage). across it's end then according to ohm's law :

I ∝ V (at constant temperature)

then,

It is also written as V ∝ I

or, V = R × I

• R is a constant called resistance of the conductor.

• The value of this constant depends on the nature, length, area of cross section and temperature of the conductor.

☛ The above equation can also be written as:

V/I=R

• V = potential difference
• I = current
• R = Resistance

Ohm's law gives a relationship between current and potential difference.

☛ Relation:-

• The current is directly proportional to potential difference.

• The current is inversely proportional to resistance.

Answer 2

The Ohm's law states that the current " I " flows through the conductor is directly proportional to the potential difference " v " of the battery

$\Rightarrow \sf v\propto I \\ \\\Rightarrow \sf v = R I$

The proportionality constant " R " is called resistance of the conductor

Resistance is a property of conductor which resist or opposes the flow of charges through it

Limitations of ohm's law

• It is not applicable for semiconductor

• It is not applicable when the temperature and surrounding conditions are not constant or same