Ohm’s law

Ohm's law is the main basic electrical
law and defines the resistance of a
device to the flow of electrons.

There are three different notations of
Ohm’s law

Unknown Current

Unknown Voltage

Unknown Resistance

(Most people can remember a picture
easier than a mathematical formula.
By knowing any two values you can
figure out the third. Simply put your
finger over the portion of the symbol
you are trying to figure out and you
have your formula).