In this reference sheet, ElectricalandElectronicsEngineering.com presents a reference formula for fundamentals principles and rules in electric circuits.

## Basic Properties

Voltage, resistance, and current are the three basic properties of electric circuits:

SI unit of voltage is volts

SI unit of resistance is ohms

SI unit of current is amps

## How to Solve Resistors in Series

Two or more resistors are solved in series by simply adding them.

i.e R(eq) = R1 + R2 + … Rn

## How to Solve Resistors in Parallel

Two or more resistors in parallel are solved using formula.

Learn more about parallel circuits

More Electrical Laws and Principles: