electro-, electr-, electri-

1. Relating to or concerned with electricity; such as, an electrical engineer.
2. Using, providing, producing, transmitting, or operated by electricity.
3. Related to or associated with electricity, but not containing it or having its properties or characteristics.

Examples include electrical engineer, electrical handbook, and electrical rating.

4. Of or relating to the science or technology of electricity.

The term electrical is used in a general sense, often to refer to the use of electricity as a whole as opposed to other forms of energy; for example, electrical engineering or an electrical appliance.

The surgical removal of some bodily organ or part using electrocautery.

An electric circuit in which its behavior may be described by the same mathematical equations as some physical system that is under study.

1. An angle denoting a certain instant in an alternating circuit cycle or the phase difference between two alternating quantities.
2. An angle that specifies a particular instant in an alternating-current (AC) cycle or expresses the phase difference between two alternating quantities which is usually expressed in electrical degrees.

The phase difference between two alternating quantities is expressed as an electrical angle.

1. The direction in a crystal in which electrical resistance is at a minimum.
2. The x axis in a quartz crystal where there are three such axes in a crystal, each parallel to one pair of opposite sides of the hexagon.

All pass through and are perpendicular to the optical or z axis.

3. In electrocardiographic work, it is the direction of the electrical forces in the heart at a given moment in the cardiac cycle.

A switch action in which, upon actuation of one station, the switch changes the contact position, electrically locks the switch in that position, and releases any station previously actuated.

An electrically produced force tending to move the armature (a coil in which voltage is induced by motion through a magnetic field) of a relay toward a given position.

A blasting cap which is ignited by an electric current and not by a spark.

The tracking axis of a radar antenna or highly directional radio antenna, corresponding to the null of a conical-scanning antenna or the maximum of a directional antenna.

1. A large, usually abrupt rise in electric current in the presence of a small increase in voltage; can occur in a confined gas between two electrodes, a gas tube, the atmosphere; such as, lightning, an electrical insulator, and a reverse-biased semiconductor diode.
2. A large, usually abrupt, rise in electric current in the presence of a small increase in electric voltage.

Breakdown may be intentional and controlled or it may be accidental; for example, lightning is the most familiar example of a breakdown.

An instrument used to measure heat evolved; for example, from fusion or vaporization.

The measured quantities of heat are added electrically to the sample and the temperature rise is noted.

1. A point in the middle of an adjustable inductor or resistor which divides it into two equivalent electrical values.
2. The point approximately midway between the ends of an inductor or resistor which divides the inductor or resistor into two equal electrical values.

The mathematical analysis of conditions and relationships in an electric circuit.

1. A set of rules directing the practical installation and application of electrically operated equipment.
2. A systematic body of rules governing the practical application and installation of electrically operated equipment and electric wiring systems.

1. Capacitors that consist of tiny storage batteries which charge and discharge rapidly.

Made of two plates separated by a thin insulator or sometimes air, when one plate is charged negative and the other positive, a charge builds up and remains after the current is removed.

When electric power is required, the circuit is switched to conduct current between the plates, and the electrical charge is released.

2. An electronic component that stores an electric charge and releases it when required.

It comes in a huge variety of sizes and types for use in regulating power as well as for conditioning, smoothing, and isolating signals.

Capacitors are made from many different materials, and just about every electrical and electronic system uses them.