Browse Definitions :
Definition

polarity

Also see bipolar signaling and unipolar signaling .

Polarity is a term used in electricity, magnetism, and electronic signaling. Suppose there is a constant voltage , also called an electric potential or electromotive force (EMF), between two objects or points. In such a situation, one of the objects or points (poles) has more electrons than the other. The pole with relatively more electrons is said to have negative polarity; the other is assigned positive polarity. If the two poles are connected by a conductive path such as a wire, electron s flow from the negative pole toward the positive pole. This flow of charge carriers constitutes an electric current . In physics, the theoretical direction of current flow is considered to be from positive to negative by convention, opposite to the flow of electrons.

The movement of electric charge carriers inevitably produces a magnetic field. Conversely, any magnetic field is the result of the motion of charge carriers. In a permanent magnet, a magnetic field is produced by the composite motions of electrons in geometrically aligned atom s. A magnetic field is characterized by poles called north and south. Magnetic polarity refers to the orientation of these poles in space.

In digital communications, data is composed of short-duration pulses called bit s (binary digits). There are two possible states for each bit: logic 0 (also called low) and logic 1 (also called high). In a closed circuit, these logic elements are represented by direct current voltages. A high-speed data signal varies rapidly between the low and high states. Common values are approximately +0.5 volts for low and +5 volts for high. In some cases different values are used, for example, -3 volts for low and +3 volts for high, or -5 volts for low and -0.5 volts for high. If both voltages have the same polarity, the signal is called unipolar; if the voltages have opposite polarity, the signal is called bipolar.

This was last updated in March 2010

Join the conversation

3 comments

Send me notifications when other members comment.

Please create a username to comment.

For me the above works o.k.as a definition but not enough as an explanation. It is helpful but makes me feel like a simpleton!
Cancel
I want more definition about polarity and dilute.. thank you so....... much..
Cancel
Well stated AnonymousUser. I feel the same way.
Cancel

-ADS BY GOOGLE

File Extensions and File Formats

Powered by:

SearchCompliance

  • 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 (...

  • data protection impact assessment (DPIA)

    A data protection impact assessment (DPIA) is a process designed to help organizations determine how data processing systems, ...

SearchSecurity

  • quantum key distribution (QKD)

    Quantum key distribution (QKD) is a secure communication method for exchanging encryption keys only known between shared parties.

  • identity theft

    Identity theft, also known as identity fraud, is a crime in which an imposter obtains key pieces of personally identifiable ...

  • cybercrime

    Cybercrime is any criminal activity that involves a computer, networked device or a network.

SearchHealthIT

SearchDisasterRecovery

  • disaster recovery (DR)

    Disaster recovery (DR) is an area of security planning that aims to protect an organization from the effects of significant ...

  • disaster recovery plan (DRP)

    A disaster recovery plan (DRP) is a documented, structured approach that describes how an organization can quickly resume work ...

  • business continuity plan (BCP)

    A business continuity plan (BCP) is a document that consists of the critical information an organization needs to continue ...

SearchStorage

  • cloud storage

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

  • secondary storage

    Secondary storage is storage for noncritical data that will not be frequently accessed.

  • logical unit number (LUN)

    A logical unit number (LUN) is a unique identifier for designating an individual or collection of physical or virtual storage ...

Close