Question

Two bulbs $X$ and $Y$ having same voltage rating and of power $40$ watt and $60$ watt, respectively, are connected in series across a potential difference of $300$ volt, then

• A. $X$ will glow brighter
• B. resistance of $Y$ is greater than $X$
• C. heat produced in $Y$ will be greater than $X$
• D. voltage drop across $X$ will be smaller than $Y$

Answer 1

Answer: (A)

Resistance $\propto \frac{1}{\text{ Power }}$. Thus, $40W$ bulb has a high resistance, because of which there will be more potential drop across $40W$ bulb. Thus $40W$ bulb will glow brighter.