Technical Electronics Engineering Dictionary
"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"

"I" to Inc, "Ind" to Inj, "Inp" to Ins, "Int", "Inv" to Iz

I2C. Originally designed to be a battery control interface, now used in micro-controller based [uP] professional, consumer and telecommunications control, diagnostic and power management buses. The I2C bus uses a bi-directional Serial Clock Line [SCL] and Serial Data Lines [SDA]. Three speed modes are specified: Standard; 100kbps [Bits per Second], Fast mode; 400kbps, High speed mode 3.4Mbps. I2C is short for Inter-IC.

I2L. Integrated Injection Logic.

I2R Loss. I-Squared-R losses, or Current [squared] x Resistance. Also called Copper Losses. The power lost because of the current through a resistanc.

IC. Refer to the definition of Integrated Circuit.

IC Synchros. Obsolete, synchros with reverse rotation and limited torque capabilities.

IDC. See Insulation Displacement Connector.

IDE. Integrated Drive Electronics (Advanced Technology Attachment). A series of standards released between 1999 and 2005 which defined the electrical and mechanical interfaces between a personal computer's mother board and a Hard Disk Drive. Maximum bus speed of the IDE bus is 133MBps over an 18 inch Parallel cable. The IDE interface is also known as the ATA interface. The ATA interface was rendered obsolete by the introduction of the Serial ATA [SATA] interface in 2005.

Idempotent Law. In Boolean algebra, combining a quantity with itself either by logical addition or logical multiplication will result in a logical sum or product that is the equivalent of the quantity (for example, A + A = A; A x A = A).

Identity Law. In Boolean algebra, the law which states that any expression is equal to itself.

Identity Comparator. A circuit that compares to numbers and provides an output to indicate if the numbers are equal or unequal, as in a 74521 TTL 8-bit Identity Comparator.

Idle-Channel Noise. Noise that is present in a communications channel when no signals are applied. Note: The channel conditions and terminations must be stated for idle-channel noise measurements to be meaningful.

Idler Frequency. In a parametric amplifier, the difference between the input signal and the pump signal frequency. Also called the Lower-Sideband Frequency.

IEEE-1284. A personal Computer interface that defined a parallel printer bus specification at 1MBps. IEEE-1284 defines a Point-To-Point asynchronous bi-directional interface. Devices may be either 1284 compatible {the older parallel port devices} or 1284 compliant. The maximum length for a printer cable is 25 feet, 32 feet maximum. Centronics parallel cables run out to 12 feet. The IEEE1284 cable replaced the 'Centronics' cable which is obsolete.

IF Amplifier. Usually a narrow-bandwidth IF amplifier that is tuned to one of the output frequencies produced by the mixer.

IF Bandwidth. The range of frequencies centered around the IF frequency, limited by the 3dB amplitude points.

IF Frequency. See Intermediate Frequency.

IF Selectivity. The ability of the IF stages to accept the signal from one station while rejecting a signal from adjacent stations.

IGFET. Insulated Gate Field-Effect Transistor. Any FET that has an insulated gate. Also see FET manufacturers.

Image Frequency. An undesired frequency capable of producing the desired frequency through heterodyning.

Image Rejection. The ability of a tuner to reject a signal which is the sum or difference of the tuners oscillator and IF signals.

IM Distortion. See Intermodulation Distortion.

Impedance. The total opposition offered to the flow of an alternating current. It may consist of any combination of resistance, inductive reactance, and capacitive reactance. The total passive opposition offered to the flow of electric current. The symbol for impedance is Z. Impedance is a function of frequency, except in the case of purely resistive networks.

Impedance Bridge. A bridge circuit used for measuring resistance and reactance.

Impedance Matching. The connection of an additional impedance to an existing one in order to accomplish a specific effect, such as to balance a circuit or to reduce reflection in a transmission line. The matching of impedances from one circuit to another to insure optimum power transfer.

Implosion. The inward bursting of a CRT because of high vacuum [Definition of CRT]. The opposite of explosion.

Impulse. A short surge of electrical, magnetic, or electromagnetic energy. A unidirectional voltage that rises rapidly and than decays to zero at a slower rate.

Impulse Noise. Noise consisting of random occurrences of energy spikes having random amplitude and and spectral content. Note: Impulse noise in a data channel can be a definitive cause of data transmission errors. Noise generated in discrete energy bursts which has a characteristic wave shape.

Impulse Waveform. A short duration pulse. The pulse duration is defined from the peak duration to 50 percent of peak.

Impulse Duration

Incandescent. The process of emitting light by being heated to a high temperature, as in passing current through a wire until it heats up [light bulb].

Incandescent Light Bulb. An incandescent lamp or incandescent light makes light by heating a metal filament wire to a high temperature until it glows. Note that an incandescent bulb output light in a particular light spectrum. A lamp or bulb that generates light by incandescence.

Incident Wave. The wave that strikes the surface of a medium. The wave that travels from the sending end to the receiving end of a transmission line.

In-Circuit Meter. A meter permanently installed in a circuit; used to monitor circuit operation.