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 RadioShack Consumer Electronics Glossary: I

I
Electronics: The symbol for current.
 
IC
Acronym: Integrated Circuit
DIY, Electronics: A component which contains a circuit using two or more components incorporated into a single package.
 
Ice
Weather: The solid form of water. It can be found in the atmosphere in the form of ice crystals, snow, ice pellets, and hail for example.
 
Ice Crystal
Weather: Frozen precipitation in the form of slowly falling, singular or unbranched ice needles, columns, or plates. They make up cirriform clouds, frost, and ice fog. Also, they produce optical phenomena such as halos, coronas, and sun pillars. May be called "diamond dust." it is reported as "ic" in an observation and on the metar.
 
Ice Pellet
Weather: Frozen precipitation in the form of transparent or translucent pellets of ice, which are round or irregular in shape. They have a diameter of 0.2 inches (5 mm) or less. They are classified into two types: hard grains of ice consisting of frozen rain drops or largely melted and refrozen snowflakes; pellets of snow encased in a thin layer of ice which have formed from the freezing of droplets intercepted by pellets or water resulting from the partial melting of pellets. It is reported as "pe" in an observation and on the metar. Related term: sleet
 
Ice Storm
Weather: A severe weather condition characterized by falling freezing precipitation. Such a storm forms a glaze on objects, creating hazardous travel conditions and utility problems.
 
Icicle
Weather: Ice that forms in the shape of a narrow cone hanging point down. It usually forms when liquid water from a sheltered or heated source comes in contact with below-freezing air and freezes more or less rapidly as it flows.
 
ID3 Tag
Audio: A small file containing album, artist, track, and other info that can be attached to an MP3 file.
 
iDEN
Acronym: Integrated Dispatch Enhanced Network
Telephony: A wireless technology developed by Motorola that works in the 800 MHz, 900 MHz, and 1.5 GHz radio bands. The technology supports, on one handset, voice-both dispatch radio and using PSTN connection-numeric paging, Short Message Service (SMS), data and fax transmission.
 
IEC
Acronym: International Electrotechnical Commission
Electronics: An international organization that prepares and publishes international standards for electrical, electronic and related technologies.
 
IEEE«
Acronym: Institute of Electrical and Electronics Engineers
Electronics: A non-profit, technical professional association which prepares and publishes technical standards for computer engineering, biomedical technology, telecommunications, electric power, aerospace electronics, consumer electronics, et al.
 
IEEE-1284
Computers: A high-speed bidirectional parallel port specification used by printers and devices like card readers.
 
IEEE-1394
Computers: A port capable of transferring large amounts of data. Currently the fastest available port and commonly known as FireWire. Originally, the generic name for the IEEE-1394 standard, established in 1995, was "Serial Bus". There have been a number of tradenames for this standard: In 2002, the 1394 Trade Association reached a licensing agreement with Apple Corporation to adopt the FireWire trademark, logo and symbol as a brand identity for the IEEE-1394 standard. Additional information on IEEE-1394 connectivity available through RadioShack can be found on our IEEE-1394 Cable Answers and IEEE-1394 Connector Answers pages.
 
IF
Acronym: Intermediate Frequency
Communications: A frequency used in the demodulation process (see Dual-conversion and Triple-conversion)
 
IFF
Acronym: Interchange File Format
Digital Video: The Amiga image file format.
 
IGFET
Acronym: Insulated Gate Field Effect Transistor
Electronics: Another name for a MOSFET.
 
IGT
Measurement: Gate trigger current.
 
Image
Communications: A false signal generated by the scanner during signal reception and demodulation.
 
Image Formats
Digital Video: The method of compressing and saving an image file.
 
Image Processing Time
Digital Video: The time lag that occurs between the shutter is pressed and the camera is ready to take another picture, which occurs while the camera converts the image from an analog format to a digital format and stores the data.
 
Image Sensor
Digital Video: A solid-state device containing a photosite for each pixel in the image. Each photosite records the brightness of the light that strikes it during an exposure.
 
Image Stabilization
Digital Video: An optical or digital system for removing or reducing camera movement.
 
Impedance (Z)
DIY, Electronics: The total opposition that a circuit offers to the flow of alternating current or any other varying current at a particular frequency. It is a combination of resistance (R) and reactance (X), measured in ohms.
 
Impedance, Input
Electronics: The total impedance offered by a device or circuit when it is connected to a power source.
 
Impedance Matching
Audio: The act of matching the output impedance of a source to the input impedance of a load in order to attain maximum power transfer.
 
IMSI
Acronym: International Mobile Station Identifier
Telephony: A number assigned to a mobile station by the wireless carrier uniquely identifying the mobile station nationally and internationally. See also MIN, TMSI.
 
IMT-2000
Acronym: International Mobile Telecommunications-2000
Telephony: The standard for 3G (third-generation) mobile cellular communications systems. In Europe, it is called UMTS and in Japan it is called J-FPLMTS.
 
Incandescent Lighting: See Lighting, Incandescent
 
Inches of Mercury (Hg): see .
 
Inductance
DIY, Electronics: The property of a circuit to oppose a change in current. The moving magnetic field produced by a change in current causes an induced voltage to oppose the original change.
 
Inductive Load: see Load, Inductive
 
Inductive Reactance: see Reactance, Inductive
 
Inductor
Electronics: A length of conductor used to introduce impedance into a circuit. The conductor is usually wound into a coil to concentrate the magnetic lines of force and maximize the inductance.
 
Inductor, Air-core
Electronics: An inductor wound on a dielectric core such as wood, glass or plastic.
 
Inductor, Ferrite-core
Electronics: An inductor wound on a ferrite core.
 
Inductor, Solenoidal-core
Electronics: An inductor wound on a rod-shaped core.
 
Inductor, Toroidal-core
Electronics: An inductor wound on a donut-shaped core.
 
Inductor, Variable
Electronics: An inductor in which the inductance can be changed by turning a shaft.
 
Infrared: see IR.
 
Initial Voltage: see Voltage, Initial.
 
Inkjet
Computers: A type of printer that sprays dots of ink onto paper to create the image.
Digital Video: True photo-quality prints can be created using inkjet printers with resolutions of up to 2880 dpi (dots per inch).
 
Institute of Electrical and Electronics Engineers: see IEEE«.
 
Instrument-level
Audio: An audio signal coming from a musical instrument using an electrical pick-ups. The power of an instrument level is not standard and varies from mic-level to line-level.
 
Insulator
Electronics: A material having a high resistance to the flow of electric current to prevent the leakage of current from a conductor.
 
Integrated Circuit: see IC.
 
Integrated Dispatch Enhanced Network: see iDEN.
 
Intellectual-property
Refers to the intangible value created by human creativity and invention, which includes but is not limited to copyrights, trademarks, and patents.
 
Intensity: see Saturation.
 
Interchange File Format: see IFF.
 
Interconnect
Telephony: A telephone interface between a repeater or control station and the Public Switched Telephone Network (PSTN). This allows telephone calls to be placed and received from a mobile transceiver.
 
Interlaced
Digital Video: An image sensor that gathers its data by processing the odd lines first and then the even lines. See Progressive Scan.
 
Intermediate Frequency: see IF.
 
International Date Line
Weather: The line of longitude located at 180° east or west (with a few local deviations) where the date changes by a day. West of the line it is one day later than east of the line.
 
International Electrotechnical Commission: see IEC.
 
International Mobile Station Identifier: see IMSI.
 
International Mobile Telecommunications-2000: see IMT-2000.
 
International Organization for Standardization: see ISO.
 
International Standard Book Number: see ISBN.
 
Internet
Internet: A decentralized global network connecting millions of independent host computers in more than 100 countries. The Internet can be accessed through a commercial Internet Service Provider (ISP) or through an online service, such as MSN. The World Wide Web is a subset of the Internet.
 
Internet Device
Internet: A specialized device that allows the user to connect to the Internet but that is not a full-fledged computer -- such as a PDA that has a microbrowser and e-mail capabilities, or a system that allows sending and receiving e-mail or adding Web content via a television.
 
Internet Service Provider: see ISP.
 
Interpolation
Digital Video: A method used to increase the resolution of an image by adding pixels based on the value of the surrounding pixels. However, this method can cause artifacting and pixelation.
 
Intersect
Measurement: To meet and cross at a point.
 
Inverter
Electronics: A device which plugs into a 12-volt DC power source, such as a car's cigarette lighter, and provides a 120-volt AC output via a standard two- or three-prong electrical plug.
 
Ion
Electronics: An atom with which does not have the same number of electrons in orbit and protons in the nucleus. If there are fewer electrons than protons, it is a positive ion. If there are more electrons than protons, it is a negative ion.
 
Ionize
Electronics: To produce ions removing electrons from (or adding electrons to) atoms or molecules.
 
Ionosphere
Weather, GPS, Communications: A region of the earth's atmosphere that extends from a height of 30 miles to 250 miles above the surface of the earth. It is located between the mesosphere and the exosphere and is included as part of the thermosphere. It is called the ionosphere because incoming solar radiation causes ionization in this region of the atmosphere. This ionization affects the transmission of radio waves, reflecting shortwave frequencies and bending or scattering other frequencies.
 
IP
Acronym: Internet Protocol. 
Computers, Internet: The protocol that specifies the format of packets and the addressing scheme used to route a message. In general use, IP is usually combined with Transport Control Protocol (TCP).
 
IP, Dynamic Address
Acronym: Internet Protocol, Static Address
Computers, Internet: A dynamic IP address is one in which the computer is assigned one of a number of IP addresses each time it logs into the ISP's server.
 
IP, Static Address
Acronym: Internet Protocol, Static Address
Computers, Internet: A static IP address is one in which the computer is assigned the same IP address each time it logs into the ISP's server.
 
IR
Acronym: InfraRed
Electronics: 1) The part of the light spectrum between approximately 0.72 microns and 1,000 microns.
2) Technology which uses that frequency of light to carry information (such as transferring data from a camera or organizer to a computer).
Weather: The long wave, electromagnetic radiation of radiant heat emitted by all hot objects. On the electromagnetic spectrum, it can be found between microwave radiation and visible light. Water vapor, ozone, and carbon dioxide are capable of absorbing or transmitting infrared radiation. May be referred to as ir.
 
IrDA«
Acronym: Infrared Data Association«
Electronics, Computers: The organization which defines the standard that allows data to be transferred between devices using infrared light instead of cables.
 
Iris Diaphragm
Digital Video: A continuously-adjustable lens aperture consisting of interposed metal leaves. See illustration.
 
IS-136: see TDMA.
 
IS-95: see CDMA.
 
IS-95-A: see CDMA.
 
IS-95-B: see CDMA.
 
IS-95-C: see CDMA2000.
 
ISBN
Acronym: International Standard Book Number
A unique machine-readable identification number used to identify a book or other printed material.
 
ISDN
Acronym: Integrated Services Digital Network
Computers: ISDN lines typically contain two carrier or bearer channels ("B"), which carry the user's data, and one data channel ("D") that carries the signaling information to connect or disconnect the "B" channels.
 
ISO
Shorthand: The short name for the International Organization for Standardization (not an acronym).
Digital Video: A number rating indicating the relative sensitivity to light of an image sensor or photographic film. Faster film (higher ISO) is more sensitive to light and requires less exposure than slower film.
 
Isolator
Metal Detectors: A non-metal stem which attaches the search coil to the control shaft eliminating metallic interference in the detection pattern. On some detectors, the entire lower shaft is made of a nonmetal substance.
 
ISP
Acronym: Internet Service Provider
Internet: A company that provides access to the Internet.
 
ITAVm
Measurement: Maximum average on-state current (50 Hz half sine wave).
 
ITGQM
Measurement: Maximum repetitive controllable on-state current.
 
IT(RMS)
Measurement: RMS on-state current.
 
ITSM
Measurement: Maximum surge on-state current, non-repetitive (50 Hz half sine wave)

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