Automotive Dictionary

EFC

Effect

Effective

Also see

Effective area: Actual flow area of an air inlet or outlet. Gross area minus area of vanes or grille bars.

Effective deflection: Deflection of a suspension system under a particular load

Effectiveness Buildup

See

Effective pedal travel: The portion of brake pedal travel converted to piston movement in the master cylinder.

Effective pressure

See

Effective temperature: Overall effect on a human of air temperature, humidity, and air movement.

Efficiency

The accomplishment of something with the least amount of effort, energy, or fuel.
Output of a device, system, or activity, divided by the input necessary to create the output. In a compressor the efficiency would be the work output, as measured by pressure change, divided by the energy input (usually electrical).
The efficiency of an electrical motor is the ratio of mechanical output to electrical input. It represents the effectiveness with which the electrical motor converts electrical energy into mechanical energy
A measure (usually a ratio) of the useful energy provided by a dynamic system versus the total energy supplied to it during a specific period of operation.

Also see