Current Electricity Charging Discharging Of Capacitors Question 527
Question: If two electric bulbs have 40W and 60W rating at $ 220V $ , then the ratio of their resistances will be
[BHU 1999; KCET 2001]
Options:
A) 3 : 2
B) 2 : 3
C) 3 : 4
D) 4 : 3
Show Answer
Answer:
Correct Answer: A
Solution:
$ P=\frac{V^{2}}{R}\Rightarrow $
$ \frac{R _{1}}{R _{2}}=\frac{P _{2}}{P _{1}}=\frac{60}{40}=\frac{3}{2} $
BETA
