Relays Flashcards
Relays are magnetically operated ______
Relays are magnetically operated switches
What is the purpose of a magnetic coil in relay?
The magnetic coil opens and closes the contacts when voltage is applied to it or removed from it.
What are the two types of relays?
Power and Control
A _____ is a magnetically operated switch that directs signals. Each set of contacts is similar to asingle pole double throw (SPDT) switch.
A control relay is a magnetically operated switch that directs signals. Each set of contacts is similar to asingle pole double throw (SPDT) switch.
What would be the only difference between the construction and operation of a power and control relays.
The only difference is that power relays are larger, allowing them to handle higher levels of current.
In general, a relay consists of a ____, ______, ____, and spring.
In general, a relay consists of a magnetic coil, contacts, armature, and spring.
If the relay is used as a control relay, C1 contact is connected to a circuit. The relay acts as a _____ switch
If the relay is used as a control relay, C1 contact is connected to a circuit. The relay acts as a SPDT switch
If the relay is used as a power relay, C2 contact is connected to the circuit or equipment. The relay acts as a ________.
If the relay is used as a power relay, C2 contact is connected to the circuit or equipment. The relay acts as a SPST closed switch.
If the relay is used as a control relay, C1 and C2 are connected to circuits. When the relay is energized, the signal is present at circuit 2 connection. The relay acts as a _______.
If the relay is used as a control relay, C1 and C2 are connected to circuits. When the relay is energized, the signal is present at circuit 2 connection. The relay acts as a SPDT switch.
Which part of a relay ensures, with no input power applied, that the common terminal connects to the normally closed contacts?
Spring
What is the schematic symbol for a relay?
What is the reference designator letter for relays?
The reference designator for relays is K
The magnetic core and coil are indicated by a zig-zag line or a core with one loop of wire. The contacts appear similar to the symbols used for switches.
What are the two types of special relays
The latched relay uses one set of contacts to keep the relay energized, even after the energize voltage has been removed. Latch relays are used to POWER UP electronic systems.
Time delay relays operate after a specific amount of time elapses from the moment the energizing voltage is applied. Time delay relays are also used to POWER UP electronic systems. Its main purpose is to delay the armature operation.
What type of relay stays energized after removing the input voltage?
Latched
Solenoids are closely related to relays; they are also an electromagnetic switch. Solenoids are used to make electrical connections and perform mechanical functions. The difference between a relay and solenoid is that the core of a solenoid is ____ and the core of a relay is _______.
The difference between a relay and solenoid is that the core of a solenoid is movable and the core of a relay is stationary.
The movable metal core of a solenoid is called a _____. Some plungers have electrical conductors with contacts attached to them and others have mechanical linkages attached.
The movable metal core of a solenoid is called a plunger.
In the schematic, which contact is the common terminal?
3
The part of the relay shaded BLUE is called what?
Armature
