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The ratio of output-signal current to input-signal current for an electron tube, transistor, or magnetic amplifier, the multiplier section of a multiplier phototube, or any other amplifying device; often expressed in decibels by multiplying the common logarithm of the ratio by 20.



Related Terms

ELECTRON-BEAM CHANNELING

The technique of transporting high-energy, high-current electron beams from an accelerator to a target through a region of high-pressure gas by creating a path through the gas where the gas density may be temporarily reduced; the gas may be ionized; or a current may flow whose magnetic field focuses the electron beam on the target.

AMPERAGE

An electron or current flow of one coulomb per second, past a given point in a circuit.

EFFECTIVE BANDWIDTH

The bandwidth of an assumed rectangular band-pass having the same transfer ratio at a reference frequency as a given actual band-pass filter, and passing the same mean-square value of a hypothetical current having even distribution of energy throughout that bandwidth.

EXCITATION

The production of magnetic flux by supplying electric current to the field poles of a generator to create a variable magnetic field.

ANODE CURRENT

The electron current flowing through an electron tube from the cathode to the anode. Also known as plate current.

ELECTROKINETOGRAPH

An instrument used to measure ocean current velocities based on their electrical effects in the magnetic field of the earth.

EKMAN CURRENT METER

A mechanical device for measuring ocean current velocity which incorporates a propeller and a magnetic compass and can be suspended from a moored ship.

MIDSHIP SECTION AREA COEFFICIENT

(CM): The ratio of the immersed area of the midship section to the area of the circumscribing rectangle having a breadth equal to the breadth of the ship and a depth equal to the draught. CM = AM (B x T), CM values range from about 0.85 for fast ships to 0.99 for slow ships.

FIGURE OF MERIT

A performance rating that governs the choice of a device for a particular application; for example, the figure of merit of a magnetic amplifier is the ratio of usable power gain to the control time constant.

MAGNETIC EARPHONE

[ENG ACOUS] An earphone in which variations in electric current produce variations in a magnetic field, causing motion of a diaphragm.

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