Browse Definitions:
Definition

henry (H)

The henry (symbolized H) is the Standard International ( SI ) unit of inductance . Reduced to base SI units, one henry is the equivalent of one kilogram meter squared per second squared per ampere squared (kg ­ m 2 ­ s -2 ­ A -2 ).

In a circuit where the current is changing at a constant rate of one ampere per second (A/s), an inductance of 1 H results in the generation of one volt (1 V) of potential difference across an inductor. More rapid current changes produce much greater surges of electromotive force. This is the principle by which a spark coil generates a high and dangerous voltage.

The henry is a large unit of inductance. In audio-frequency ( AF ) and radio-frequency ( RF ) applications, units of millihenrys (mH), where 1 mH = 10 -3 H, and microhenrys (µH), where 1 µH = 10 -6 H, are common. Occasionally, the filter choke in a power supply, or a field coil designed to produce a large voltage upon release of its stored magnetic energy, will be found whose value can be expressed in henrys. In very-high-frequency ( VHF ), ultra-high-frequency ( UHF ), and microwave devices and systems, units of nanohenrys (nH), where 1 nH = 10 -9 H, and picohenrys (pH), where 1 pH = 10 -12 H, are used.

Also see capacitor , inductor , reactance , and farad .

This was last updated in March 2011

Join the conversation

1 comment

Send me notifications when other members comment.

By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy

Please create a username to comment.

how we convert the unit of mutul inductin volt seconed per ampere in to Joul ampere per square
Cancel

-ADS BY GOOGLE

File Extensions and File Formats

SearchCompliance

  • smart contract

    A smart contract, also known as a cryptocontract, is a computer program that directly controls the transfer of digital currencies...

  • risk map (risk heat map)

    A risk map, also known as a risk heat map, is a data visualization tool for communicating specific risks an organization faces. A...

  • internal audit (IA)

    An internal audit (IA) is an organizational initiative to monitor and analyze its own business operations in order to determine ...

SearchSecurity

SearchHealthIT

SearchDisasterRecovery

  • incident management plan (IMP)

    An incident management plan (IMP), sometimes called an incident response plan or emergency management plan, is a document that ...

  • crisis communication

    Crisis communication is a method of corresponding with people and organizations during a disruptive event to provide them with ...

  • Zerto

    Zerto is a storage software vendor that specializes in enterprise-class business continuity and disaster recovery in virtual and ...

SearchStorage

  • network-attached storage (NAS)

    Network-attached storage (NAS) is dedicated file storage that enables multiple users and heterogeneous client devices to retrieve...

  • SSD write cycle

    An SSD write cycle is the process of programming data to a NAND flash memory chip in a solid-state storage device.

  • data storage

    Data storage is the collective methods and technologies that capture and retain digital information on electromagnetic, optical ...

Close