 # Ohm's Law

### Related Terms

Ohm's Law is a mathematical equation that shows the relationship between electric voltage, current and resistance. Ohm's Law was named after Bavarian mathematician and physicist Georg Ohm.

Ohm's Law can be stated as three mathematical equations, all derived from the same principle. In the following equations, V is voltage measured in volts, I is current measured in amperes and R is resistance measured in ohms:

• V = I x R
• R = V / I
• I = V / R

Knowing any two of the values of a circuit, one can determine the third using Ohm's Law. For example, if a circuit has a current of 2 amperes, and a resistance of 1 ohm, then according to Ohms Law, voltage equals 2 (V = 2 x 1).

Typically, Ohm's Law is only applied to DC circuits and not AC circuits.

Note well: The letter "E" is sometimes used in representations of Ohm's Law for voltage instead of "V."

LATEST ARTICLES
Texting & Chat Abbreviations

From A3 to ZZZ we list 1,559 text message and online chat abbreviations to help you translate and understand today's texting lingo. Includes Top... Read More »

Huge List of Computer Certifications

Have you heard about a computer certification program but can't figure out if it's right for you? Use this handy list to help you decide. Read More »

STUDY GUIDES
Computer Architecture Study Guide

Computer architecture provides an introduction to system design basics for most computer science students. Read More »

Network Fundamentals Study Guide

Networking fundamentals teaches the building blocks of modern network design. Learn different types of networks, concepts, architecture and... Read More »

The Five Generations of Computers

Learn about each of the five generations of computers and major technology developments that have led to the computing devices that we use... Read More »