R: Rack Regulating Transformer

rack

1. A standardized steel framework that is designed to hold 19-in.-wide panels of various heights on which units of electronic equipment are mounted. Also known as "relay rack." 2. A frame for holding or displaying articles. 3. A bar that has teeth along one of its long faces so it can mesh with a gear.

radar

A device or system for detecting and identifying distant objects or determining their range, location, speed, or direction of travel by means of radio waves, which are reflected from or retransmitted by the object. The term is derived from the original term " radio detection and ranging." The principle is used in several process control sensor designs, particularly those for motion, flow, and level detectors.

Radar Level Detector

radial

In a direction that is perpendicular to the shaft centerline.

radian

A metric unit for a plane angle.

radiance

The rates of flow of radiant energy with respect to time. Expressed in watts.

radiant exitance

The total radiant flux that is emitted by a source divided by the surface area of the source.

radiant flux

The rate of flow of radiant energy with respect to time.

radiant fluxmeter

A device that measures the amount of radiant flux that is emitted or absorbed. The units typically would be watts per unit area.

radiant intensity

The energy that is emitted per unit of time per unit solid angle along a specific linear direction.

radiated EMI

Electromagnetic energy that is undesirably coupled out...