Current Electricity Charging Discharging Of Capacitors Question 95
Question: A heater of 220 V heats a volume of water in 5 minute time. A heater of 110 V heats the same volume of water in
[AFMC 1993]
Options:
A) 5 minutes
B) 8 minutes
C) 10 minutes
D) 20 minutes
Show Answer
Answer:
Correct Answer: D
Solution:
Heat produced $ =\frac{V^{2}}{R}t $ i.e. when voltage is halved, heat produced becomes one-fourth. Hence time taken to heat the water becomes four times.
BETA
