Current Electricity Charging Discharging Of Capacitors Question 454
Question: A resistor $ R _{1} $ dissipates the power P when connected to a certain generator. If the resistor $ R _{2} $ is put in series with $ R _{1} $ , the power dissipated by $ R _{1} $
[CPMT 1985; MNR 1998]
Options:
A) Decreases
B) Increases
C) Remains the same
D) Any of the above depending upon the relative values of $ R _{1} $ and $ R _{2} $
Show Answer
Answer:
Correct Answer: A
Solution:
Equivalent resistance in the second case $ =R _{1}+R _{2}=R $ Now, we know that $ P\propto \frac{1}{R} $ Since in the second case the resistance $ (R _{1}+R _{2}) $ is higher than that in the first case (R1).
Therefore power dissipation in the second case will be decreased.
BETA
