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One of the door ajar switches is showing an open door. The switches are part of the latches inside the door.
It is not really a circuit, traffic lights in todays world are controlled by programable logic controllers or a plc. There are rungs of logic to control the changing of the lights which are known as the inputs and outputs where the voltage is controlled to change the lights from red to yellow and green.
sirs if you could explain me detail about the staircase lighting ckt diagram & explain how does the switch function.
um.. a switch is a part of a series circuit because parallel circuits don't have switches
If the lights are the load of the circuit, then the lights will be off if the circuit is open.
== == Yes, there are 3-way dimmer switches. Normally staircase lights plus bed room lights need these kind of 3-way switches to turn lights on or off from more than one place. Such lighting arrangements can use dimmers if u need as usual nothing to worry. A dimmer will help save energy, may prolong the life of the bulbs, and will permit greater variability of the amount of light to be used.
Find out what circuit the lights are on by shutting off breakers until the lights go out. Find the wire that connects to that breaker. If there is no wallboard or insulation in the garage , follow the circuit to the light. If there is a switch then it will have to be somewhere in that circuit and before the light fixture. If your situation is different from this, please use the discussion page and explain.
Lights are on in closed circuit. It means that is a current flowing when circuit is being closed.
It's possible that one of the switches in a door jamb is no good. The switch 'thinks' the door is open and thus turns on the lights. It happens intermittently because the switch contact may have some contamination that completes the circuit and then it burns off opening the circuit. The repair is to replace all the door switches. Another possibility is the interior dimmer switch on the dashboard.
Public Library. Take a pad and pencil, you will be doing a lot of writing.
The circuit breakers in a panelboard feed separate circuits. The lights that stay on are on a different circuit than the ones that go off. To fine the circuit that feeds the lights that stay on, go to the panelboard and turn off the breakers one by one until the lights go out. This is the circuit that feeds that circuit of lights. Remember that lights and receptacles can be on the same circuit together.
While many of the terminal parts of a circuit may be a series element, in most circuits there will be both series and parallel components. Neither is superior - they both have their appropriate applications.