Ohm's Law Calculator

Understanding Ohm's Law and Electrical Calculations

Ohm's Law is one of the most fundamental principles in electrical engineering and physics. It states that the current through a conductor between two points is directly proportional to the voltage across the two points, provided the temperature and material remain constant.

Basic Ohm's Law Equations

Primary Ohm's Law Formula

V = I × R

Where: V = Voltage (Volts), I = Current (Amperes), R = Resistance (Ohms)

Derived Formulas

I = V ÷ R R = V ÷ I

These equations allow you to solve for any variable when two are known

Electrical Power Relationships

Power is the rate at which electrical energy is transferred by an electric circuit. In resistive circuits, Joule's Law can be combined with Ohm's Law to produce several useful power equations.

Power Equations

P = V × I P = V² ÷ R P = I² × R

Where: P = Power (Watts)

		Key Applications: Ohm's Law is essential for circuit analysis, component sizing, safety calculations, and troubleshooting electrical systems. It applies to resistive circuits and helps determine safe operating conditions.
	

Practical Applications

Circuit Design: Engineers use Ohm's Law to determine appropriate component values, ensuring circuits operate within safe voltage and current limits.

Safety Analysis: By calculating power dissipation, engineers can prevent component overheating and ensure reliable operation of electrical systems.

Troubleshooting: Technicians use Ohm's Law to identify faulty components by measuring voltage, current, and resistance values and comparing them to expected values.

		Important Note: Ohm's Law applies to linear, resistive elements. It may not apply directly to components like diodes, transistors, or other non-linear devices, though it remains useful for analyzing the resistive portions of complex circuits.
	