Ohm’s Law

What is Ohm’s Law?

This was derived by a German physicist named as Georg Ohm (1789-1854),

Ohm’s Law is a formula used to calculate the relationship between Voltage, Current and Resistance in an electronic circuit.

In electronics, Ohm’s Law (E = IR) is as fundamentally important as Einstein’s Relativity equation (E = mc²) is to physicists.

E = I x R

Which is voltage = current x resistance, or volts = amps x ohms, or V = A x Ω.

In Ohm’s Law each alphabets stands as below which is used in our day to day electronics and in circuits we work on:

QuantityOhm’s Law
Unit of measure
Role in circuitsIn case you’re wondering:
VoltageEVolt (V)Pressure that triggers electron flowE = electromotive force (old-school term)
CurrentIAmpere, amp (A)Rate of electron flowI = intensity
ResistanceROhm (Ω)Flow inhibitorΩ = Greek letter omega

If two of these values are known, technicians can reconfigure Ohm’s Law to calculate the third. Just modify the pyramid as follows:

How to reconfigure Ohm’s Law formula.