A boot camp was arranged for soldiers. The soldiers live in barracks with 20 rooms. The instructor of the barrack needs to switch on the lights to all the room in the barrack sharp at 5 AM and switch off the lights at 10 PM sharp. How should the wiring of the lights be done so that the instructor can switch on and off the lights at the same time from his room? Mention the type of circuit and explain.
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Answers
Suppose that you were given a small light bulb, an electrochemical cell and a bare copper wire and were asked to find the four different arrangements of the three items that would result in the formation of an electric circuit that would light the bulb. What four arrangements would result in the successful lighting of the bulb? And more importantly, what does each of the four arrangements have in common that would lead us into an understanding of the two requirements of an electric circuit?
The activity itself is a worthwhile activity and if not performed before, one ought to try it before reading further. Like many lab activities, there is power in the actual engagement in the activity that cannot be replaced by simply reading about it. When this activity is performed in the physics classroom, there are numerous observations that can be made by watching a class full of students eager to find the four arrangements. The following arrangements are often tried and do not result in the lighting of the bulb.