Ohm’s law formula

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Go to Ohm’s law calculator.
Ohm’s law define current magnitude of the current that flows through out resistor like one given in figure bellow (Ohm’s law circuit).

Ohm's-law-circuit

So current through resistor R, according to Ohm’s law formula is

Ohm's-current-law-formula

This form of Ohm’s law is also known as Ohm’s current law. However, point is that Ohm’s law formula connects three physical magnitudes (voltage, current and resistance) over one resistor. Now, if current and voltage are known, resistance can be calculated as (Ohm’s resistance law)

Ohm's-resistance-law-formula

And, of course, if resistance and current are known, voltage can be calculated as (Ohm’s voltage law).

Ohm's-voltage-law-formula

Ohm’s law is not applicable on resistors in DC regime only, but on capacitors and inductors in AC regime as well. This is Ohm’s law in complex domain. We can see now why Ohm’s law formula one of the most practical and popular formulas in physics and engineering. It is not however applicable on diodes and neon tubes.

Go to Ohm’s law calculator.

External links:

Ohm’s law on Wikipedia
Ohm’s law on Physicsclassroom
Ohm’s law on Hyperphysics

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