A) 40 W
B) 60 W
C) 100 W
D) all give equal brightness
Correct Answer: A
Solution :
When bulbs are connected in series, the current in each bulb remains same. As power \[P={{i}^{2}}R,\] so, the bulb having maximum resistance will appear brightest. The resistance of a bulb, \[R=\frac{{{V}^{2}}}{p}\propto \frac{1}{p}\] (For same V) \[\therefore \]The bulb of least power possesses maximum resistance. Hence, 40 W bulb will appear brightest when connected in series with other bulbs.
You need to login to perform this action.
You will be redirected in
3 sec
