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On entering a dark room, you would normally, manually, switch on the light. It is possible to use an electronic sensor and circuitry to automatically turn on the light when you enter the room, and to switch off the light once you have left the room for a specific amount of time.
When a switch is opened (turned off) the circuit is broken and the electricity stops flowing, lights and other devices cease to work. Once the switch is turned on (closed) the electricity will once more flow and lights and other devices will work once more. A good example is when you enter a dark room. You switch on the wall switch, which turns on the light in the room, and you can see what you are doing.
Only if the existing switch box has an unswitched hot and neutral in it.
turn 2 switches on wait one minute, turn one off go in the room if the bulb is off and warm it was the last one you turned off if its cold its the one you didnt touch and if its on its the only switch left on.
In North America the switch can be placed either inside the room or outside the room. When it is inside the room it is placed on the opening side of the door so that when you enter the room, the switch can be flipped on. When the switch is located on the outside of the room a convenient placement is close to the door opening so that when you open the door the switch can be turned on in one continuous motion.
First you turn on one of the switches and don't enter the room for sometime, till the light inside is heated up. Then switch that light off, and then turn the second one on and enter the room. The one heated up (feel by hand) is the first switch that was turned on, the one glowing is the second switch turned on and the remainder not hot nor light up is the third switch * WHY DOES IT MATTER IF YOU CANT OPEN THE DOOR??
elecrical energy
In the room near the theater
Turn the first light switch on and wait 5 minutes, turn it off. Turn the second light switch on and go into the other room. The light bulb that is currently "on" represents the second light switch. Touch the next two light bulbs and which ever is hotter represents the first light switch. You can find the third by cancelling out the other two.
No. In a room with any number of mirrors of any size, when you switch off the light or blow out the candle, the room becomes just as dark as a room without mirrors.
No. In a room with any number of mirrors of any size, when you switch off the light or blow out the candle, the room becomes just as dark as a room without mirrors.
If you have two switches connected to a light in a room.example your bed room and you are in your bed you wont have to get out of your bed to switch off the light but u can switch it off by pulling a switch over your head.