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Question

Fig. 9.12 shows three bulbs A, B and C each of rating 100 W, 220 V connected to the mains of 220 V. Answer the following:

(a) How is the bulb A connected with the mains? At what voltage does it glow?

(b) How are the bulbs B and C connected with the mains? At what voltage does the bulb B glow?

(c) How is the glow of bulbs A and C affected if bulb B gets fused?

(d) How is the glow of bulbs B and C affected if bulb A gets fused?


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    Solution

    (a) Bulb A is in parallel connection with the mains. It glows at 220 V

    (b) Both bulbs B and C are in parallel connection with the mains. The bulb B glow at 110 V.

    (c) Bulb C will not glow because bulb B is in series connection whereas the bulb A will glow.

    (d) Bulb B and C both will glow.


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