EFC

1. Abbreviation for electronic fuel control
2. Abbreviation for Electronic Feedback Carburetor (Chrysler)

EFCA

Abbreviation for Electronic Fuel Control Assembly (Ford)

EFE

Abbreviation for Early fuel evaporation system

EFE system

Abbreviation for Early Fuel Evaporation System

Effect

See

• Auger Effect
• Automatic Steering Effect
• Back-porch Effect
• Barkhausen Effect
• Barrier effect
• Buchmann-Meyer Effect
• Chimney Effect
• Engine braking effect
• Ground effect
• Hall effect
• Joule-Thomson Effect
• Kadenacy effect
• Liftoff effect
• Load alteration effect
• Peltier Effect
• Quantum Hall Effect
• Seebeck Effect
• Self-centering effect
• Synergetic effect
• Synergistic effect
• Weight Transfer Effect

Effective

1. Actual rather than theoretical or potential.
2. Producing an effect.

See

• Cost-effective
• Indicated mean effective pressure
• Mean effective pressure

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

• Brake Effectiveness Buildup

Effective pedal travel

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

Effective pressure

See

• Brake mean effective pressure
• Indicated mean effective pressure
• Mean effective pressure

Effective stroke

Working or power stroke in a two-stroke engine

Effective temperature

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

Efficiency

1. The accomplishment of something with the least amount of effort, energy, or fuel.
2. 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).
3. 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
4. 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.

See

• Adiabatic Efficiency
• Air Standard Efficiency
• Ampere-hour Efficiency
• Atmospheric dust spot efficiency
• Available Power Efficiency
• Boiler Efficiency
• Brake Efficiency
• Brake Thermal Efficiency
• Braking efficiency
• Catalytic efficiency
• Cathode Efficiency
• Charging efficiency
• Electrical Efficiency
• fuel efficiency
• Mechanical efficiency
• Quantum Efficiency
• Thermal efficiency
• Trapping efficiency
• Volumetric efficiency

Efficiency Gas Furnace

See

• High Efficiency Gas Furnace

Efficiency of a solar cell

The ratio of the electrical power output of a solar cell to the solar power that it intercepts. For example, a solar cell 3 inches (7.6 cm) in diameter intercepts about 2.39 watts of solar power under full sun conditions. If the electrical output of this cell is 0.34 watt, the efficiency will be (0.34/2.39)=0.14, or 14%.

Efficiency Ratio

See

• Energy Efficiency Ratio
• Seasonal Energy Efficiency Ratio

Efficient Motors

See

• Energy Efficient Motors

Effluent

The products of combustion plus the excess air discharged from gas utilization equipment

See

• Flue Gas

Effort

The force which is doing work on an object.

See

• Braking effort
• Supplier Cost Reduction Effort

EFI

(EFi) Abbreviation for Electronic Fuel Injection

EFT

Abbreviation for Engine Fuel Temperature

EFV

Abbreviation for Early Fuel Evaporation

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