Question

an electric bulb is rated 40 watt 220 volt how many bulbs can be connected in parallel with each other across the two wires of 220 volt line if the maximum allowable current is 6 ampere?

Answer 1

Given - P = 40W
            V = 220V
​             I = 6A

To find - Number of bulbs can be connected in parallel with each other across two wires of 220 V line.

Formulas used - V = IR 
                           R = V2/P

Solution -  R = V2 / P
                     = (220)2/ 40        { given V = 220V }
                    = 48400 / 40
                   =  1210 ohm.

Now, we know V = IReq
Req = V/I
      = 220 / 6 
      = 36.66.. ohm

Let us take there are x number of bulb in parallel

1 / 37 = x / 1210
x = 1210 / 36.66..
     =  33.006 

x = 33 ( round up)

Therefore, 33 bulbs can be connected in parallel with each other across two wires of 220V
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