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On a ground floor home there are three switches connected to 2 bulbs and 1 fan - how do you know which switch is for the fan and which are for the 2 bulbs?
Wiki User
∙ 10y ago
You left out the most important parts of the riddle. The way the question
is worded, all you have to do is turn one switch on, walk over to where the
fan and the bulbs are, see which one is on, mark the switch, and do that
two times.
The way the riddle works: The switches are on the ground floor of the house,
and the bulbs and the fan are on the 3rd floor. Now, how do you figure out
which switch controls what, without climbing the stairs more than once ?
-- Stand by the switches. Turn 2 of them ON. Wait 15 minutes.
Then turn one of the 2 OFF, and turn the 3rd one ON.
Then run upstairs and see what you have there.
-- Whatever is OFF ... either the fan or 1 bulb ... belongs to the switch that's OFF.
Now you only have to associate the 2 remaining switches with the 2 remaining items.
-- If 2 bulbs are ON, then they belong to the 2 switches that are ON.
One bulb is cool, and the other one is warm.
-- If only 1 bulb is ON, then it's either cool or warm.
-- A warm bulb that's ON belongs to a switch that was ON for 15 minutes
before you ran upstairs.
-- A cool bulb that's ON belongs to the switch that you turned ON
just before you ran upstairs.
You have identified all 3 switches with only one trip up the stairs.
Wiki User
∙ 10y ago
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Can you control each of the bulbs arranged in series using switches?
The switches would have to be of a type that could switch out a bulb and at the same time switch in its place a resistor of equivalent value.
What bulbs glow when switch A is closed and switches B and C are open?
it's bulb 3
Three different bulbs are connected in series when switch is closed the last bulb does not glow why?
because the switch is closed
What is an advantages of a series?
If a switch is added, all of the bulbs/lights/motors can be turned on and off at the same time, instead of needing several switches. Also, if a bulb is dead, you can't tell what bulb is dead because they are all connected.
What is a advantages of a series circuit?
If a switch is added, all of the bulbs/lights/motors can be turned on and off at the same time, instead of needing several switches. Also, if a bulb is dead, you can't tell what bulb is dead because they are all connected.
What is the noise emanating from a dimmer switch?
All dimmer switches hum. The older they get, the louder the hum. If you have compact florescent bulbs in the fixture, this will cause the switch to hum louder.
How do I turn on three light bulbs in sequence using one switch?
To do something like that you would first have to have each light on it's own smart switch. Then you would need a master switch that would control each of the other smart switches. You can find switches like this at www.smarthome.com
What is the main purpose of SPDT and DPDT switches?
The number of poles refers to how may separate signals or if you will, wires you switch when the switch is activated or deactivated. For example your typical light switch just switches the hot wire and turns the light on or off and is called a SPST switch. The SPDT switches a signal to either of two circuits. So for example, if you had hot connected to the input and a light connected to each output (Throw), you would have one light on and one off and each time you throw the switch the lights switch which is off and which is on. The DPDT can switch two separate signals at the same time and each goes to one of two separate circuits. If you had two separate breakers and four light bulbs you could hook up one breaker hot to one pole and the other breaker to the second pole. If you had four light bulbs each connected to each of two switch outputs, then one bulb from each breaker would be on and when switched the other bulb on each breaker would be on. For diagrams just search for SPDT and DPDT.
There are 3 switches downstairsEach corresponds to one of the three light bulbs in the attic.You can turn the switches on and off and leave them in position.How would you identify which switch corresp?
Turn switch A on and then wait for a couple minutes. Turn switch A off and switch B on. Go to the attic, one light bulb should be on, that's switch B. Now feel the light bulbs, one should still be warm from having been turned on and then off, that's switch A. The one that's off and cool is switch C.
Which bulb will glow at first when 3 bulbs are connected in series and switch is connected after 1 bulb?
All the three would glow at the same instant.
If a chandelier has 5 bulbs how can it be re-wired to switch on separately 3-2 bulbs?
How did you want to switch on the bulbs? If there isn't a separate circuit already running from the switch, through the wall, and to the chandelier, then you'd have buy pull chain switches. The chandelier would have to have holes drilled to mount the switches. The load wire from the house would be wired to the load side of each switch. Then two bulbs to one switch and three bulbs to the other switch. All the neutrals would tie together to the neutral from the house. I would HIGHLY recommend just purchasing a dimmer switch from your local hardware or home center. You could easily change the switch in the wall to a dimmer switch and have a lot more control over the illumination, and it wouldn't look like you have burned out light bulbs in your fixture. You can rewire a 5-bulb light for a 3-2 switch in a couple of other ways. Remove the light from the ceiling, open the lamp wiring and divide the selected 3 and 3-light sets. All of the neutral wires stay together (usually wired to the screw shell of the lamp holders). Add a 3-way switch in the fixture (e.g., off, 3-on, 5-on, or off, 2-on, 5-on) or bring each group of 3 and 2 hot wires out to separate wall switches. Switch 1 is 2 bulbs, switch 2 is the other 3 bulbs, and switch 1 and 2 together is all 5 bulbs. Or you can put all or some of them on dimmers.
Can xenon lamps be used with a dimmer switch?
120 volt xenon bulbs are fully dimmable just like a regular incandescent bulbs, using regular old 120 volt dimmer switches.
