The basic laws of electrical circuits focus on the basic circuit parameters of voltage, current, power, and resistance. These laws define how each circuit parameter relates to each other. These laws were discovered by Georg Ohm and Gustav Kirchhoff and are known as Ohm's law and Kirchhoff's laws.
Electrical Circuits: Basics of Voltage and Current Laws.
Ohm's law is the relationship between voltage, current, and resistance in a circuit. It is the most common (and simplest) formula used in electronics. Ohm's law can be written in several ways, all of which are commonly used.
Ohm's law is also useful in determining the amount of power a circuit uses, because the power dissipated by a circuit is equal to the current flowing through it multiplied by the voltage (P=IV). Ohm's law determines the power dissipated by a circuit as long as two of the variables in Ohm's law are known for the circuit.
A basic application of Ohm's law and the power relationship is to determine how much power is dissipated as heat in a component. This information helps you choose the right size component with the right power for a given application.
