Home of RF and Wireless Vendors and Resources

One Stop For Your RF and Wireless Need

Ohm's law

Ohm's law states that current through a conductor is directly proportional to the voltage across it, provided temperature and other physical conditions will not change. Ohm law can be derived from the following table.

V (Volts) 1 2 3 4 5
I (Amperes) 0.1 0.2 0.3 0.4 0.5
V/I Ohms 10 10 10 10 10

From the table, ratio V/I has a constant value of 10. It is imperative that R for this conductor does not change when V and I both change accordingly.

ohm law

Directly proportional means, doubling V doubles I, trebling V trebles I and so on. In mathematical term, Ohm's law can be written as I α V

The other way of mentioning ohm law is that resistance of a conductor does not change so long as physical conditions remain the same.

Conductors which obey ohm's law are usually made of metals, carbons and some alloys. They are referred as ohmic conductors. The conductors not obeying ohmi's law are non ohmic whose resistance changes with voltage and current. The transistors are referred as non ohmic. The characteristic curve for ohmic conductor is shown in the figure.


Variable capacitor
Variable resistor
Transformer basics and types
Ohm law
Diac vs Triac
Analog vs Digital Multimeter
LED vs Laser
Microphone basics and types
Resistor basics
Electrolytic capacitor
Capacitor basics
Inductor basics
Reed Switch
Photo Diode vs Photo Transistor
SCR or thyristor
Halfwave rectifier vs Fullwave rectifier

RF and Wireless Terminologies

Share this page

Translate this page