Question

According to Ohm's law, which of the following gives correct relation between current I and voltage V?
1. \(I \propto {1 \over V}\)
2. \(I \propto V\)
3. \(I \propto {1 \over V^2}\)
4. \(I \propto V^2\)

Answer 1

Correct Answer - Option 2 : \(I \propto V\)

CONCEPT:​

• Ohm's Law: A law that states that electric current is proportional to voltage and inversely proportional to resistance.

Mathematically,

V = IR 

where R is the resistance, I is current, and V is the voltage across the conductor.​​

• Limitations of Ohm's Law:
  • The temperature should be constant.
  • It is not applicable for non-linear elements. (eg semiconductors)

EXPLANATION:

According to Ohm's Law electric current 'I' is proportional to voltage 'V'. So

\(I \propto V\)

So the correct answer is option 2.