Question

Two bulbs are fitted in a room in the domestic electric installation. If one of them glows brighter than the other then:

• A. The brighter bulb has smaller resistance.
• B. The brighter bulb has larger resistance.
• C. Both the bulbs have the same resistance.
• D. Nothing can be said about the resistance unless other factors are known.

Answer 1

The correct option is A The brighter bulb has smaller resistance.

In domestic electric installation all appliances are connected parallely.
$\Rightarrow$ $\text{Brightness}\propto \frac{1}{\text{Resistance of bulb}}$

$\Rightarrow$ More Bright bulb has lower resistance.