TO open and close so that we can make it complete
A light switch
It open and close it
No
The function of a switch is to open or close a path for electricity.
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a switch.
To open or close a single wire connection between a power source and a load.
normally close relay is closed initially and when a signal arrive to it it will open and dont let the current pass i9n opposit to normally open
In an open circuit no cuttent can flow so the switch would have to be in the off position- the switch is open and not completing the circuit. A closed circuit is one where current can flow all the way through, the switch would have to on and therefore closed.
loop checking is perform before cable termination..the difference between a close loop and open loop is,tha close loop has a feedback while the open loop has not.
Sounds like a faulty switch or wiring. You may have a limit switch in the lifting/lowering mechanism, a faulty switch on your dash to control it, or a broken wire between the dash switch and the motor.