Physics
Purvi's friend Tim wants to connect a fuse to his oven. He wants to control the oven from two different locations. Shown below is his circuit diagram.
(a) Which one of the two, A or B should be a live wire?
(b) In the event of an overload, will the fuse serve its purpose?
(c) What is the meaning of the statement that the bulb is rated 600W, 220 V?
Answer
(a) The switch is always connected to the live wire. In above diagram, wire B is connected to switch so wire B must be the live wire.
(b) No, the fuse will not serve its purpose. In the diagram, the fuse is connected to the earth wire and not the live wire. In case of overload, the excess current will first pass through the oven damaging it and after that will flow through the fuse.
(c) It means that if the bulb is operated on a 220 V supply, the electric power consumed by it is 600 W i.e., 600 J of electric energy is consumed by the bulb in 1 s.
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