In an electric circuit three indicandescent bulbs A ,B and C of rating 40 w, 60 w,and 100 w respectively are connected I parallel to an electric source. which of the following is likely to happen regarding their brightness?
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Bulbs are rated presuming that they all are to be connected with the same voltage supply (say 220 V in India). In parallel combination, voltage remains same, so greater the power (watt), greater the brightness. Therefore, brightness B of three bulbs are as
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Ans.(c) Brightness of bulb B will be more than that of A Explanation: Since bulbs are connected in parallel so resistance of combination would be less than arithmetic sum of resistance of all the bulbs. So, there will be no negative effect on flow of current. As a result, bulbs would glow according to their wattage.
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