Browse Definitions :
Definition

Ohm's Law

Ohm's Law is the mathematical relationship among electric current, resistance and voltage. The principle is named after the German scientist Georg Simon Ohm.

In direct-current (DC) circuits, Ohm's Law is simple and linear. Suppose a resistance having a value of R ohms carries a current of I amperes. Then the voltage across the resistor is equal to the product IR. There are two corollaries. If a DC power source providing E volts is placed across a resistance of R ohms, then the current through the resistance is equal to E/R amperes. Also, in a DC circuit, if E volts appear across a component that carries I amperes, then the resistance of that component is equal to E/I ohms.

Mathematically, Ohm's Law for DC circuits can be stated as three equations:

E = IR

I = E/R

R = E/I

When making calculations, compatible units must be used. If the units are other than ohms (for resistance), amperes (for current), and volts for voltage), then unit conversions should be made before calculations are done. For example, kilohms should be converted to ohms, and microamperes should be converted to amperes.

This was last updated in May 2019

Continue Reading About Ohm's Law

Join the conversation

8 comments

Send me notifications when other members comment.

Please create a username to comment.

How do you remember the Ohm's Law equations by?
Cancel
its easy guys!
Cancel
very good definition and mathematical expression
Cancel
ohm's law just gives only expression for resistance at constant tempreture. at constant tempreture, voltage and current ratio of any D.C circuit is equal to resistance.
Cancel
Thanks for sharing amazing knowledge on Ohm's Law. As a beginner, it helped me a lot in learning Ohm's Law.
Cancel
Specifically, what is Ohm's Law and its examples? Still didn't get it.. :(
Cancel
Ohm's law are just really named after the scientist who help develop the science in electricity; Georg Simon Ohm.
Cancel
what is ohm's law?
jh
Cancel

-ADS BY GOOGLE

File Extensions and File Formats

SearchCompliance

  • data governance policy

    A data governance policy is a documented set of guidelines for ensuring that an organization's data and information assets are ...

  • risk management

    Risk management is the process of identifying, assessing and controlling threats to an organization's capital and earnings.

  • compliance as a service (CaaS)

    Compliance as a Service (CaaS) is a cloud service service level agreement (SLA) that specified how a managed service provider (...

SearchSecurity

SearchHealthIT

SearchDisasterRecovery

SearchStorage

  • cache memory

    Cache memory, also called CPU memory, is high-speed static random access memory (SRAM) that a computer microprocessor can access ...

  • capacity management

    Capacity management is the broad term describing a variety of IT monitoring, administration and planning actions that are taken ...

  • cloud storage

    Cloud storage is a service model in which data is transmitted and stored on remote storage systems, where it is maintained, ...

Close