how are relay used?

Answer 1

A relay is just an electrical switch. Relays are used to assist in the application of power through a mechanical device using low power to control a higher power such a the solenoid (relay) on your car. You could not put the amperage required to crank your car through a small switch (well you could but it would be impractical and burn up the contacts of the switch due to the current level) so the key operates the solenoid (relay) that connects the battery to the starter.
Relays are also used to assist in the application of other circuits like a motor on an antenna tower. Power to operate the motor is fed to the relay along with a control cable. When the control cable is energized it closes the relay and allows power to the rotor. Otherwise you'd have to climb up the tower every time you wanted to turn it.
The smaller voltage energizes a coil. The coil becomes an electromagnet which connects or disconnects the leads of the power it's controlling.

Answer 2

Relays are quite common in home appliances where there is an electronic control turning on something like a motor or a light. They are also common in cars, where the 12V supply voltage means that just about everything needs a large amount of current. In later model cars, manufacturers have started combining relay panels into the fuse box to make maintenance easier. For example, the six gray boxes in this photo of a Ford Windstar fuse box are all relays:
https://www.electrikals.com/products/rc-relays/relays?cnid=162&cid=690&page=1&pagesize=20

Answer 3

A relay is used to switch electrical devices that use a large current. This avoids having to use a large cumbersome switch. When you start a car engine with the ignition switch a relatively small current operates a relay which is itself an electromagnet switch to pass a large current. My car also has a relay to operate the headlights.

Answer 4

Relays are switches that open and close circuits electromechanically or electronically. Relays control one electrical circuit by opening and closing contacts in another circuit. As relay diagrams show, when a relay contact is normally open (NO), there is an open contact when the relay is not energized. When a relay contact is Normally Closed (NC), there is a closed contact when the relay is not energized. In either case, applying electrical current to the contacts will change their state.
Relays are generally used to switch smaller currents in a control circuit and do not usually control power consuming devices except for small motors and Solenoids that draw low amps. Nonetheless, relays can "control" larger voltages and amperes by having an amplifying effect because a small voltage applied to a relays coil can result in a large voltage being switched by the contacts.
Protective relays can prevent equipment damage by detecting electrical abnormalities, including overcurrent, undercurrent, overloads and reverse currents. In addition, relays are also widely used to switch starting coils, heating elements, pilot lights and audible alarms.

https://www.electrikals.com/products/r/relays?cid=690&page=1&pagesize=15

Answer 5

The main use for a relay is to move the switched load away from the switching point.

Answer 6

a relay is used to switch a higher current on with a lower current, the lower current is wired into the input on the relay, and then there is also an input ofr the voltage that you want to be switched on when yu apply the smaller current/voltage, this is then emmited from the ouput pin(there are usually two output pins on a relay

Answer 7

Here are two simple animations illustrating how relays use one circuit to switch on a second circuit. When power flows through the first circuit (1), it activates the electromagnet (brown), generating a magnetic field (blue) that attracts a contact (red) and activates the second circuit (2).

Answer 8

They are used just like a regular switch, but controlled by an electric current. The control signal energizes an electromagnet (a solenoid actually) which either opens or closes the signal line.

Answer 9

what like TTY? if you are talking about that then you have to call the TTY operater and the he/she will identify themselves with a number then she/he will ask you your friends number then they will call it and when your deaf friend picks up the operator will become your friend and say everything she says and vise versa expect she will type what you say.
and you have to say go ahead when you are finished.
there are more relays like bikes and running where they have a stick and they have to pass it to a person then that person with the stick runs and so on so forth

Answer 10

current is moved through an electromagnet by means of a solenoid that closes the normally opened contacts