Question

The wattage of an electric bulb is W and resistance of its filament is r. if it is connected to a voltage v. the current in its i. the correct relation of these :-
A) v2=w2R.
B) v=w2R.
C) I=rootoverR/w
D) v=root over WR. How.

Answer 1

p=v*I
Power is W here
w=v*v/R
${v}^{2} = w \times r \\ then \: v = \sqrt{w \times r}$