Alternating current (AC) is current that flows in one direction only.

AC voltage is either single phase or three phase

A cogeneration power plant is a power plant that changes energy from moving water into electrical energy.

Combustion power generation plants use steam to produce electricity

A conductor is a material that resists the flow electrons.

An insulator is a material with low resistance that permits electrons to flow through it easily.

Resistance is measured in ohms.

The most common type of wire used today is aluminum.

In general, the higher, the current flow, the higher amount of work performed by the circuit

Alternating current is current the reverses direction at regular intervals

Transformers are classified as step up step down or isolation transformers

A transient voltage is a temporary unwanted voltage that ranges from a few volts to several thousand volts and less from a few microseconds to a few milliseconds

The most common material used for a semiconductor device is silicon

Electrical control system use AC voltage

Line voltage is voltage at 115 VAC to 1000 VAC

A semiconductor is a material in which electrical conductivity is between that of a conductor and that of an insulator

A solid – state relay is a switching device that has sets of contacts that are closed by a magnetic force

An electromechanical relay is a switching device That uses semiconductor materials to change on and off characteristics

Diodes are used for rectification and to block current flow

The two most common voltages for electrical control systems are 24 VAC and 115 VAC

An electronic control system is a type of control system that uses solid-state devices to control refrigeration, and HVAC systems

Triacs are used as solid-state relays

High voltage is voltage over 600 VAC

___ is the energy produced from the flow of electrons through a conductor

___ law expresses the relationship between voltage, current and resistance, and a circuit

A(n) ___ is a device that performs work

__ Is sine wave distortion from motors and electrical devices that enters a power distribution system directly on the wires/grounds or through the magnetic coupling of adjacent wires

A _ Circuit is a circuit that has two or more components connected so that there is one path for current to flow

__ is the amount of electrons flowing through a conductor

A__ circuit is a circuit that has two or more components connected so that there is more than one path for current to flow

The opposition of current flow is called __

__ is the production of current flow due to a magnetic field on a coil

__ is the international unit of frequency equal to one cycle per second

Transient voltages are often caused by lightning or stored voltages being released from __

A __ transformer has a lower output voltage than input voltage

A __ Is a three – terminal semiconductor, switch – like device that controls current according to the amount of voltage applied to the base

A _ Is a type of semiconductor device that allows current to flow in one direction only

A _ Is an electrical device that consist of two thin metal plates with an insulating dielectric material separating them

A _ Is a device that changes AC voltage into DC voltage

A _ Is an overcurrent protection device with a fusible link that melts and opens a circuit when a overload condition or short circuit occurs

A _ Is a switch that isolates electrical circuits from a voltage source to allow safe access into electrical panel or equipment for maintenance or repair

A _ Is a large heavy dash duty relay – like switching device that uses low-voltage to energize or De-energize the high-current nonmotor load connected to it

A(n) _ Shut off the power supply to a circuit when current flow is excessive

A _ Is an overcurrent protection device with a mechanism that automatically opens a circuit when an overload or short circuit occurs

A(n) _ Power plant is a power plant that generates both electricity and heat for use

A(n) _ is the interconnection of conductors and electrical elements through which current is designed to flow

A(n) _ Circuit is a combination of series – and parallel – connected components in a circuit

__ are power frequencies that are whole integer multiples of the base frequency (60 Hz)

Hydroelectric, power plans, solar, power, and wind power are __ sources of energy

___ Energy is used to produce heating and cooling for residential commercial and industrial use

___ is the positive (+) or negative (-) state of an object

A(n) __ transformer has the same number of primary and secondary turns in the windings

Voltage interruptions may Be momentary, temporary, or ____

____ is the amount of electrical pressure in a conductor

A(n) __ Transformer has a higher output voltage than input voltage

A(n) ___ Consists of two sets of windings wrapped around an iron or laminated steel core

A(n) ___ diode Is a type of diode designed to produce light when forward – biased

A(n) ___ Is a device that uses a low-voltage coil to close one or more sets of contacts to switch high voltage loads on and off

A(n) ___ Is a type of diode that changes resistance, or switches on when exposed to light

A(n) ___ is a type of thyristor that is capable of only switching direct current

A(n) ___ is a solid – state switching device used to switch alternating current

A(n) ___ Is an electronic device in which all devices, such as transistors, diode, and resistors, are contained in a single package or chip as components

___ Voltage is voltage of 50 VAC or less

A(n) ___ Diode is a type of diode designed to operate in a reverse – biased mode without being damaged