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Electricity & Electronics > Common Electrical Symbols & Diagrams > Flashcards

Common Electrical Symbols & Diagrams Flashcards

1
Q

Auxiliary Contact

A

Light duty contacts in a motor starter that are in addition to the main motor contacts.

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2
Q

When the start coil is energized the ___ is actuated.

A

auxiliary contact

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3
Q

Auxiliary Contacts can be either normally open or normally closed. True or false?

A

True

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4
Q

Backfeed

A

Voltage present in a circuit that comes from the direction of the load.

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5
Q

Control Circuit, Motor

A

The circuit of a control apparatus or system that carries the electric signals directing the performance of the controller, but does not carry the main power current.

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6
Q

Downtime

A

The time equipment is not operating because of a breakage or failure.

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7
Q

Emergency Stop Switch

A

A safety device installed in the system, when activated, will immediately start the emergency stop sequence.

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8
Q

Fail Safe

A

A control circuit having adequate control and alarm devices to provide reliable protection of the system.

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9
Q

Flow Switch

A

A switch designed to measure and report the flow of a fluid or gas.

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10
Q

Holding Circuit

A

A circuit path that is parallel to a momentary start push-button.

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11
Q

Ladder Diagram

A

A schematic diagram resembling a ladder.

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12
Q

Level or Float Switch

A

A switch actuated by liquid level. A float or some other sensing device is located in the liquid.

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13
Q

Limit Switch

A

A switch that is operated by mechanical movement of some part of the machine or equipment to alter the associated electric circuit.

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14
Q

Magnetic Overload

A

An overcurrent device that breaks an electric circuit when operated by the electromagnetic force produced by excessive load current.

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15
Q

Maintained

A

A device that when actuated remains in that position.

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16
Q

Momentary

A

A device actuated by physical means and when released returns to its original position.

17
Q

Sequence Chart

A

The operating steps in which a circuit works.

17
Q

Normally Closed

A

A switch contact that is closed when no power or force is applied to the actuating mechanism.

18
Q

Normally Open

A

A switch contact that is open when no power or force is applied to the actuating mechanism.

18
Q

Potentiometer

A

A device used to vary voltage and/or current for control purposes by varying the resistance in the circuit.

18
Q

Pilot Device

A

A manual or automatic switch used in a control circuit. It does not carry the main power current.

19
Q

Pressure Switch

A

A switch actuated by steam, water, oil, gas, or some other pressure. It opens or closes on rise or fall of pressure.

20
Q

Reference Designator

A

A control symbol designating an item such as a control relay.

21
Q

Starter

A

A device that starts and stops a motor either manually or automatically and provides overload protection.

21
Q

Schematic Diagram

A

Shows, by means of graphical symbols, the electrical connections and functions of a specific circuit without regard to the actual location of components.

22
Q

Separable

A

Circuit connections which may be joined or connected by means of terminals or plug-in jacks.

23
Q

Stop/Start Station

A

A pilot device with a normally open start switch and a normally closed stop switch.

24
Q

Temperature Control

A

A switch actuated by rise or fall of the temperature of the medium it is controlling.

25
Q

Thermal Overload

A

A device which breaks an electrical circuit when current flow is excessive by heating a tripping device.

26
Q

Three-Wire Control

A

A basic control circuit using at least three wires to connect the pilot device to the starter.

27
Q

Time Delay Switch

A

A switch actuated by an electrical timing device with contacts that will open or close after some predetermined delay.

28
Q

Wiring Diagram

A

A pictorial layout drawing that shows component location and the routing of wires and terminal connections.

29
Q

Pressure Control

A

A switch actuated by steam, water, air, oil or gas pressure.

30
Q

Pilot Light

A

A visual annunciator to indicate power to a specific circuit; the function must be defined. The letter in the center indicates lens or lamp color.

31
Q

American Standards Association (ASA)

A

Develops and documents standard electrical symbols.

Electricity & Electronics (12 decks)

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