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Heating and Chemical Effect of Current — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsHeating and Chemical Effect of Current1 Mark
MCQ
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 $R_1$
  • ✓
    Decreases
  • B
    Increases
  • C
    Remains the same
  • D
    Any of the above depending upon the relative values of $R_1$ and $R_2$
✓

Answer

Correct option: A.
Decreases
(a) 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 $\left(R_1+R_2\right)$ is higher than that in the first case $(R)$.
Therefore power dissipation in the second case will be decreased.

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