Current Electricity Charging Discharging Of Capacitors Question 452
Question: An electric bulb is rated 220 volt and 100 watt. Power consumed by it when operated on 110 volt is
[CPMT 1986; MP PMT 1986, 94; AFMC 2000]
Options:
A) 50 watt
B) 75 watt
C) 90 watt
D) 25 watt
Show Answer
Answer:
Correct Answer: D
Solution:
Resistance of the bulb = $ \frac{V^{2}}{P _{Ratate}}=\frac{220\times 220}{100}=484\Omega $ When connected with 110 V, the power consumed $ P _{Consumed}=\frac{V^{2}}{R}=\frac{110\times 110}{484}=25W $
BETA
