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Question
In following figure shows three bulbs A, B and C each of rating 100 W, 220 V connected to the mains of 220 V. Answer the following:
- How is the bulb A connected with the mains? At what voltage does it glow?
- How are the bulbs B and C connected with the mains? At what voltage does the bulb B glow?
- How is the glow of bulbs A and C affected if bulb B gets fused?
- How is the glow of bulbs B and C affected if bulb A gets fused?
Solution
- Bulb A is connected in parallel connection with the mains. It will glow when the voltage applied across the bulb is 220 V.
- Bulbs B and C are connected in series with the mains. Due to this series connection with the mains, the voltage at which they glow will be two times that of the main supply voltage. So, bulb B will glow at 110 volts
- If bulb B gets fused, bulb C, which was connected in series with it, will not glow. This will not affect the glow of bulb A because it is connected in parallel with the mains.
- If bulb A gets fused, the glow of bulbs B and C will not be affected.
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