Electronics Switches help? Easy 10 points.?

1. What does “latching” mean when used with switches?

2. What part of switches are “poles” and “throws”?

3. What is a relay? What does it do?

4. How does a relay differ from a mechanical switch?

5. What do the terms normally closed, normally open and common mean?

6. What is switch bounce? How do you prevent this?

ANY help would be much appreciated x

thanks xx

4 Answers

  • Keith
    Lv 7
    1 decade ago
    Best Answer

    1. a momentary connection causes the switch to latch and stay connected, even after the connection is broken

    2. Poles are the possible connection that a throw can make.

    A simple on off switch is single pole single throw. The moving contact has only one connection it can make, or not make. Your normal wall switch, for example.

    A single pole double throw would make one contact in one position, and another contact in the other position. A two way switch where you can turn a light on or off from either of two switches requires the two switchess be single pole double throw.

    3. a switch operated by electromagnetic coil rather than your finger

    4. relays are mechanical, but activated by an electric current.

    5. in a momentary switch activation causes a normally open switch to close, or a normally closed switch or open.

    6. when you operate a mechanical switches, for a split second the switch will actually turn on and off many times as it makes contact. You may even see a spark on the contacts. A capacitor connected from the switch to ground will reduce bounce.

  • 1 decade ago

    1. It means when you activate (press, flip, or turn) it, it stays in that position after you let go of it.

    2. Poles are the number of separate electrical circuits with an identical action a switch or relay has. Your wall switch has One pole, a switch in a stereo may have two or more. Throws are the number of separate positions a switch can be set in. The source knob on a stereo system might have 5 throw and 6 poles. The fan switch switch on a car heater is typically 4 throw.

    3. A Relay is basically a switch actuated by a magnetic coil.

    4. A relay has a magnetic coil to pull the armature down, and a spring to pull it back up. It depends on the sort of mechanical switch, but generally they have a see-saw which a spring attached to the handle pushes one way or the other, and push switches have a spring which pushes the armature up, and a latch which lets it stay down.

    5. NC is the terminal closed to the common terminal when the switch is out or the relay coil inactive, and NO the other way (switch in/coil active).

    Common is the common terminal in a pole, which each the throw in a pole connects to ,when the switch is in each respective throw position.

    6. Answered elsewhere.

  • 1 decade ago

    Keith gives good answers, but if you have very little technical knowledge, you may have trouble understanding some of them.

    1. Latching - if you have a push switch that turns on when you push it, and STAYS on when you remove your finger, then it is a latching switch. Likewise, if you push it once again, and turns off and stays off, is has "latched" again. Sometimes described as "push-on push-off".

    3. A relay is used to switch a heavy load with just a low powered circuit. Think of your car starter circuit - the ignition switch cannot handle hundreds of amps, so it pushes out less than one amp to the starter relay, which closes a HEAVY set of contacts, enough to pass some serious amperage to your starter motor.

    4. A relay is controlled by an electrical signal - a mechanical switch is controlled by your hand.

  • 5 years ago

    complicated step. look into onto bing and yahoo. this can help!

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