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33 Cards in this Set
- Front
- Back
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Continuity |
A continuous current path the absence of Continuity Indicates an open circuit |
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Inductive |
Describe and operation Where a conductor becoming Electrically charge from being near another electrically charged body or becomes magnetized by being within an existing magnetic field the process itself is called it inductive |
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Insulator |
A device or something that inhabits the flow of current the opposite of a conductor |
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Ohm |
The unit of measurement for electrical resistance |
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Thermistor |
A semiconductor device that changes resistance with a Change in temperature |
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Watts |
The unit a measurement for power consumption by load |
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Alternate current (AC) |
An electrical current that changes direction on a Cyclical basis |
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Ampere (A) |
The unit of measurement for current flow the magnitude is determined by them number of electrons passing a point at a given time |
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Conductor |
A material that readliy conducts electricity also the wire that Connects components in electrical circuit |
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Current |
The rate or volume at which electron's flow in a circuit measured in amps |
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Direct current (DC) |
An electric current that flows one direction a battery is a common source of DC voltage |
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Electromagnet |
A coil of wire wrapped around a soft iron core when a Current flows through the Coil magnetism is created |
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Load |
A device that converts electricial energy into another form of energy (heat mechanical motion light motors) are the most common Significant load in Hvac/r systems |
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Power |
The mount of energy measured in watts Consumed by an Electrical load power = voltage X current |
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Rectifier |
A device that converts AC voltage to DC voltage |
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Resistance |
The opposition to flow of electron's |
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Transformer |
Two or more coils of wire wrapped around a common core used to raise and lower voltage |
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Voltage |
A measure in volts up electional potential for current flow also known as electromotive force (EMF) |
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P E I R |
P= Power E= Voltage I=Current R=Resistance |
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Ammeter |
A test instrument used to measure current flow |
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Analog meter |
A meter that uses a needle to indicate the value on a scale |
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Clip on ammeter |
An ammeter With operated jaws that are placed around a conductor to sense the Magnitude of current flow |
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Digital meter |
A meter that provides a direct numerical reading a value measurement |
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In line ammeter |
A current reading meter that is Connected in series with the circuit under test |
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Multimeter |
A test instrument capable of reading voltage current and resistance also known as Volt ohm milliammeter |
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Contactor |
A control device Consisting of a coil and one or more sets up contacts used as a switching device in high voltage current |
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Ladder diagram |
A simplified schematic Diagram in which the load lines are arranged like the runs of a ladder between Vertical lines representing the voltage source |
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Line duty |
A protective device connected in series with a supply voltage |
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Motor starter |
A mechanical switch device used to control heavy duty motors |
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Pilot duty |
A protected device that opens the motor control circuit which then shuts off the motor |
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Short circuit |
A situation in which a conductor bypasses the load causing a very high current flow |
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Slow blow fuse |
A fuse with a Built-in time delay |
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Solenoid coil |
Any electromagnetic coil used to control a machine device such as a valve or relay contacts |
