Describe control of a single lamp from three places. Draw the relevant circuit diagram.

Describe control of a single lamp from three places. Draw the relevant circuit diagram. 
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Answer :

Single lamp control from three places- 

It consists of two way switches & intermediate switch, the circuit diagram is as shown in figure. We require two 2-way switches and one intermediate switch and a lamp. Connect all these as shown as in the diagram below. For shown positions of two-way switches, the lamp will glow only if the intermediate switch is in position 2. With these positions of the switches, if position of any one switch is changed, then the lamp will be turned off.


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