The minimum number of identical bulbs of rating 4V; 6W, that can work safely with desired brightness, when…

The minimum number of identical bulbs of rating 4V; 6W, that can work safely with desired brightness, when connected in series with a 240 V mains supply is :
  1. 20
  2. 40
  3. 60
  4. 80

Solution

60

Asked in: CBSE

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