electro-, electr-, electri-

A branch of electronics dealing with solid-state and other electronic devices for generating, modulating, transmitting, and sensing electromagnetic radiation in the ultraviolet, visible-light, and infrared portions of the spectrum.

An electron in an orbit within an atom or molecule, as distinguished from a free electron.

1. A blood gas electrode used to measure the partial pressure of oxygen in arterial blood.
2. A platinum wire electrode used in measuring arterial blood oxygen.

When a current of an appropriate voltage is applied, oxygen flows from the specimen through a gas-permeable membrane and is destroyed at the platinum surface.

An electrophoretic technique (movement of electricity charged particles in a fluid) in which the charged materials migrate on a paper strip impregnated with an electrolyte solution through which the electric current passes.

A tiny electrode with a blunt tip, used in studies of membrane potentials.

An instrument for the simultaneous visualization of a phonocardiogram and an electrocardiogram.

The simultaneous registration of a phonocardiogram as well as an electrocardiogram on an oscilloscope.

A stethoscope that suppresses the low frequencies characteristic of normal heart function to emphasize the high frequencies.

1. A device that generates electrical energy from light energy, usually as a voltage or current.
2. An instrument which converts light into electrical energy or uses it to regulate a flow of current, often incorporated into automatic control systems for doors and lighting.
3. An electronic device having an electrical output that varies in response to incident radiation; especially, to visible light.
4. A small cathode-ray tube having a fluorescent pattern whose size varies with the voltage applied to the grid.

It is used in radio receivers to indicate accuracy of tuning and as a modulation indicator in some tape recorders.

5. An electric eye can operate a mechanism so as to open a door when its invisible beam is interrupted by the approach of a person and includes a photoelectric cell which is used as an automatic controlling appliance.

It is also used in motion pictures, television, and many other industries.

1. Pertaining to the electric effects of light or other radiation.
2. Relating to, or produced by, the electrical effects of light, including the emission of electrons, the generation of a voltage, or a change in resistance.

A phenomenon in which electrons are emitted from a material (generally a metal) when it is exposed to light with a given frequency.

The classical concept of light as a continuous wave could not account for this, and it was then explained by Einstein (1905) on the basis that light is a stream of separate particles.

This interpretation, and his subsequent elaboration of it, is said to have formed the basis for much of quantum mechanics.

The electricity produced when light, or other forms of electromagnetic radiation, strike certain materials; such as, cesium, selenium, and silicon.

A galvanic cell in which usable current and voltage are simultaneously produced upon absorption of light by at least one of the electrodes.

The study of electrochemical reactions that are affected or promoted by light.

A material that absorbs incident light to produce current through an external circuit.