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Question
The minimum number of identical bulbs of rating 4 V, 6 W that can work safely with desired brightness when connected in series with a 240 V mains supply is ______.
Options
20
40
60
80
MCQ
Fill in the Blanks
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Solution
The minimum number of identical bulbs of rating 4 V, 6 W that can work safely with desired brightness when connected in series with a 240 V mains supply is 60.
Explanation:
The voltage of each bulb is 4 V.
Total voltage is 240 V.
In a series connection, the total voltage is the sum of the individual bulb voltages.
No. of bulbs × Voltage of each bulb = Total voltage
∴ No. of bulbs = `"Total voltage"/"Voltage of each bulb"`
= `240/4`
= 60 bulbs
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