The ratio of the power output of an electro-acoustic transducer, under specified conditions, to the power output of an ideal electro-acoustic transducer.



Related Terms

GAIN

The ratio of output voltage, current, or power to input voltage, current, or power in electronic instruments

POWER GAIN

The ratio of the output power delivered to a specified load by an amplifier to the power absorbed by its input circuit.

DISSIPATION LOSS

A measure of the power loss of a transducer in transmitting signals, expressed as the ratio of its input power to its output power.

AVERAGE NOISE FIGURE

Ratio in a transducer of total output noise power to the portion thereof attributable to thermal noise in the input termination, the total noise being summed over frequencies from zero to infinity, and the noise temperature of the input termination being standard (290 K).

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.

PLANT FACTOR

The ratio of the average power load of an electric power plant to its rated capacity. Also known as capacity factor.

THERMO ACOUSTICAL EFFICIENCY

Equal to the sound power level/heat release. A value used to characterize the amount of combustion noise emitted from a flame. Defined as the ratio of the acoustical power emitted from the flame to the total heat release of the flame. Approximately equal to 1 X 10-6 for premixed and turbulent flames and equal to 1 X 10-9 for diffusion and laminar flames.

LOOP GAIN

  1. The ratio of the magnitude of the primary feedback signal in a feedback control system to the magnitude of the actuating signal. 2. Total usable power gain of a carrier terminal or two-wire repeater; maximum usable gain is determined by, and may not exceed, the losses in the closed path.

AMPLIFIER

A device which enables an input signal to control power from a source independent of the signal and thus be capable of delivering an output which is greater than the input signal.

OUTPUT-METER ADAPTER

Device that can be slipped over the plate prong of the output tube 385 output-meter adapter output power of a radio receiver to provide a conventional terminal to which an output meter can be connected during alignment.

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