Lighting Conundrum

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Posted this fun teaser in here for a wider electrically minded audience ;)


There is a landing with 3 switches on a wall plate.You need to know which one of the 3 switches operates a light on the floor below.You cannot see the light below, you are alone and you are only allowed one trip downstairs to look at the light.

How do you know which switch opertaes the light?
 
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We'll see if anyone else can get it ;), if you remove the quote from your post :D
 
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It couldn't be on.

Riccle would have followed safety procedures to make sure it was off before posting the question.:cool:
 
Switch 1 off

Switch 2 On for 30 secs. and then off

Switch 3 On

If lamp not on then switch 1

If lamp off but warm switch 2

If lamp on switch 3
 
Then he would not be able to see to post:cool:

l193hood.jpg


:cool:
 
Sorry to thow a spanner in the works but...

Switch 1 on for 1 min then off
Switch 2 on
Switch 3 off

Go downstairs

If lamp off but warm - switch 1
If lamp on - switch 2
If lamp off - switch 3

However, if switch 1 is a 2-way switch and lamp was on initially, then:

Switch 1 on (actually off) for 1 min then off (actually on)
Switch 2 on (lamp on somwhere else, may not be observed)
Switch 3 off

Go downstairs

Lamp on so conclude switch 2

Wrong!!!!
 

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