A circuit has a line of 5 A.hoe many lamps of rating 40W;220 Vcan simaultaniously run on this line safely.
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gven I = 5A
power (P) of one bulb = 40W
voltage (V) = 220V
let the total no of bulbs is x
we know P = VI
40x = 220*5
= 1100
=> x = 1100/40 = 27.5
but number of bulbs has to be an integer and it should not exceed the safe number so maximum number of bulbs is 27.
power (P) of one bulb = 40W
voltage (V) = 220V
let the total no of bulbs is x
we know P = VI
40x = 220*5
= 1100
=> x = 1100/40 = 27.5
but number of bulbs has to be an integer and it should not exceed the safe number so maximum number of bulbs is 27.
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