1.

An electric bulb marked 40W – 220V is connected with an electric supply of 110v. Its electric power is (1) 100W (2) 40W (3) 20W (4) 10W

Answer»

Correct option is (4) 10W

p = \(\frac{V^2}{R}=\frac{110\times110}{220\times220}\times40\) = 10 w



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