Question

A bulb is rated 40 W; 220 V. Find the current drawn by it, when it is
connected to a 220 V supply. Also find its resistance. If the given bulb is
replaced by a bulb of rating 25 W; 220 V, will there be any change in the
value of current and resistance ? Justify your answer and determine the
change.​

Answer 1

Answer:

Here is your answer

Explanation:

P = V I ,  I = P / V = 40/220 = 0.18 A

V = I R ,  R = V / I = 220/0.18 = 122.222 ohms

Similarly for the 2nd case when bulb is replaced

I = P / V = 25/220 = 0.1136 A

R = V / I = 220/0.1136 =  1936 ohms

Hope you understand

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