Alternating Current (AC): Current flowing from zero to a positive maximum and then back to zero, flows down again to a negative maximum to return back to zero.

Backup Generators: Used for fulfilling emergency load requirement during sudden shortage of power.

Blackout: Sudden disruption of electrical power.

Contactor: It is used in control circuits.

Current: The flow of particles charged by electricity.

Diesel Engine: An internal combustion engine in which fuel oil is burnt by heat produced from air compression. The most commonly bought Industrial Diesel Engines are either Rebuilt Diesel Engine or Used Diesel Engine.

Diesel Generator: Starts up and generates power automatically during power cut.

Direct Current (DC): Current produced by storage battery or electromagnetic induction, with a unidirectional flow

Distribution: Supply of lower voltage electric power from a centralized substation to the point of end use.

Dynamo: A mechanical device that converts mechanical energy into electrical energy through electromagnetic induction process.

Electric Generator: Generates electricity from a source of mechanical energy.

Engine Generator: Generates electric power with the help of natural gas or diesel reciprocating engine.

Generator: A utility device that converts mechanical energy into electrical energy, available either in the form of direct or alternating current

Gensets: A handy power generator, converting fuel into electrical power through mechanical ways. Clip-on gensets and Underslung gensets are most popular.

HVAC: Heating, ventilation, and air conditioning

Motor Generator: Normally used either to regulate or condition power from a raw power source like electric utility grid.

Non-Utility Generator: Connected to an electric utility system, Non-utility Generator generates electricity specifically for those not owned by an electric utility.

PDU’s: Power Distribution Units

Standby Generator: Used for power backup in home, Standby Generator is driven by gasoline or LP gas.

Turbine Generator: Running on gas or steam turbine, turbine generator generates electricity through electromagnetic forces caused by steam, water or wind etc.


Generator Parts and Internal Components

Adapters: This is a device that will connect pieces of equipment that cannot be directly connected

Air Cleaner Assembly: Protective covering that protects the air filter from harsh elements that could weaken and damage it.

Alternator: This device converts mechanical energy into electrical energy.

Anti Vibration Mounts: Flexible supports for an engine that reduces the amount of noise and vibration.

Axles: A rod or spindle passing through the center of a wheel

Base Tank: A large gas tank that is placed under the generator itself

Battery Charge Rectifier: This component changes AC voltage from the battery charge windings to DC voltage for charging a battery.

Brush:  This graphite or copper made conducting element maintains sliding electrical contact between static and moving element.

Circuit Breaker:  Automatic device for stopping the flow of electricity as a safety measure.

Core: The magnetic structure built lamination in the generator.

Cradle: Covering a generator or engine, this metal frame provides extra protection from outer disturbances.

Flywheel: Storing energy in a rotating mass form, Flywheel is a very active substitution of chemical batteries.

Hour Meter: Meter that measures and tracks the amount of hours a generator runs.

Ignition Coil: Supplies DC voltage to the spark plugs.

Magneto: Built with permanent magnets, Magneto is a special kind of alternator that generates current for ignition in an internal combustion engine

Rectifier: Rectifier is used for converting alternating current (AC) to direct current (DC).

Relay: Normally used in control circuits, relay is a switch driven by electricity and rules over contactor by virtue of low amperage contacts.

Rotor: Rotor is the element that on, which the rotating of a generator depends.

Rotor winding: Comprises of all the rotor pole windings and connections.

Stator: Stator is the static or unmovable element of a generator.

Stator winding: Comprises of stator coils with their interconnections.

Switchgear: Equipment that can be used in the transmission of electricity.

Transformers: An apparatus for reducing or increasing the voltage of an alternating current.

Voltage Regulator: By modulating the flow of DC to the rotor, Voltage regulator maintains optimum generator voltage, automatically.

Winding: Winding comprises all the coils of a generator.

Generator system related terms


Air Filter: Filters out moisture, dust, rust, ect. From the compressed air.

Arc: The flow of electricity across an open gap.

Grid: In order to meet the power needs at the grids in different points, a system of power lines and generators, interconnected is used. This is a grid.

Load: Load is that the amount of electric power used by devices associated to electricity generating system.

Off-Peak: A specific period when power demand of a system is comparatively low. Counted from 10 p.m. until 6 a.m., from Monday through Saturday and during the whole day on Sunday by NERC.

Off-Peak Rate: This is the rate of cost for power used during Off-Peak periods.

Pad: Concrete pads are installed in the ground outside of a building, often including vibration insulators, to place the generator on top of.

Peak: Measurement of the maximum load that is consumed within a specified time period.

Phase: Phase measures the uniform periodic change in amplitude or magnitude of an alternating current.

Rated Voltage: The specific voltage measurement at which an engine generator set can start functioning.

Single Point of Failure: Single point of failure is a location in a redundant system where a single powers failure results in loss of electrical power to the critical load.

Standby (Backup) Service: 1. Service through a permanent connection not normally used but available in lieu of, or as a supplement to, the usual source of supply.

Standby Power: This is the backup source of electrical energy that remains dormant and starts functioning as soon as a control device instructs it to.

UPS (Uninterruptible Power Supply): Supplies power automatically and instantly during shortage of power supply. UPS operation is dependent on a primary power source such as the electric utility grid, as it does generate power itself.


Electric Power Units

Amperage: Measurement of the strength or intensity of an electric current in ampere.

Frequency: The number of occurrences of a repeating event per unit of time. Cycles per second

Hertz (Hz): unit of frequency that is equal to one cycle per second.

Inertia: The property of an object to remain at rest or remain moving unless acted upon by some outside source. In motors, inertia refers to the driven load. Once a load is in motion in amount of power to keep it in motion is reduced.

Joule: Measurement of electrical energy equivalent to the work done when a current of one ampere passes through a resistance of one ohm for one second.

Kilowatt (KW): Kilowatt is power needed to do work at the rate of 1000 joules per second.

Kilowatt-hour (KWhr): Total number of kilowatts used per hour. Or 3,600,000 joules.

KVA: KVA is kilovolt-ampere and is the unit of apparent power. KVA is used for measuring the power consumption of non-resistive equipment such as motors, computers, and most non-incandescent lighting.

Pole: The number of sets of three-way electromagnetic windings that a motor has.

OHM:  Unit of electrical resistance. Once volt will cause a current of one flow through a resistance of one ohm.

RPM:  Revolutions Per Minute

Volt: Potential difference between two points.

Voltage: Measurement of electrical potential difference expressed in volts.

Watt: Measurement of electrical power. One watt is equal to 1 joule of energy per second.


Companies and Organizations and Abbreviations


APPA: American Public Power Association A national service organization that represents 2000 municipal and other state or local publicly owned electric utilities spread across the United States.CAA: Clean Air Act

CFR: Code of Federal Regulations The codification of the general and permanent rules and regulations published by the Federal Register by the executive departments.

DOC: Diesel oxidation catalyst Designed to oxidize carbon monoxide, gas phase hydrocarbons, and the SOF fraction of diesel particulate matter to CO2 and H20.

DR: Demand Response Voluntary PJM program that compensates end-use costumers for reducing their electricity use when the reliability of the grid is threatened.

EPA: Environmental Protection Agency An agency of the US government which was created for the purpose of protecting human health and the environment.

ESP: Emergency Standby Power An independent source of electrical power that supports important electrical systems on loss of the normal power supply.

NSPS: New source performance standards Technology-based standards implemented by the EPA.

NESCAUM: National Emission Standards for Hazardous Air Pollutants Emission standards set by the US EPA.

PM: Particulate Matter  The sum of all solid and liquid particles suspended in air.

RCRA:  Resource and Conservation and Recovery Act The principal federal law in the US governing the disposal of solid waste and hazardous waste.

RICE: Reciprocal Internal Combustion Engines Any internal combustion engine which uses reciprocating motion to convert heat energy into mechanical work.

SI: Spark Ignition Internal combustion engine where the combustion process of the air-fuel mixture is ignited by a park from a spark plug.

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