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What are the limitations of Ohm’s Law?
By BYJU'S Exam Prep
Updated on: September 25th, 2023
The limitations of Ohm’s Law is it does not apply to diodes and transistors and the voltage level will be fluctuating. According to Ohm’s law, the electric current is inversely proportional to the resistance and directly proportional to the voltage. This current-voltage connection is represented mathematically as,
V = IR
Here,
- I is current.
- V is voltage.
- R is resistance.
Resistance and current can be calculated using the same formula in the following ways:
- I = V/R
- R = V/I
Table of content
Limitations of ohm’s law
- Despite the fact that unilateral electrical components such as transistors and diodes only allow current to flow in one direction, Ohm’s law does not apply to them.
- For non-linear electrical components having characteristics like capacitance, resistance, and so on, the voltage level won’t remain constant with regard to time, making it difficult to apply Ohm’s law.
Example:
- A water volt-ammeter. It is an illustration of a unilateral network, to which Ohm’s law does not apply.
- Non-Ohmic conductors are semiconductors that defy Ohm’s law, such as silicon and germanium.
Summary:
What are the limitations of Ohm’s Law?
Ohm’s Law has two drawbacks: it doesn’t apply to transistors and diodes, and the voltage level will fluctuate. From the Ohm’s law, electric current is proportional inversely to the resistance and directly to the voltage.
