You are given three bulbs of 25, W,40, W,and | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) The power $P$ consumed by a bulb is given by the formula $P = \frac{V^2}{R}$,where $V$ is the voltage across the bulb and $R$ is its resistance.As

Vedclass · Accepted Answer

$60\, W$ bulb

Vedclass · Answer

(C) The power $P$ consumed by a bulb is given by the formula $P = \frac{V^2}{R}$,where $V$ is the voltage across the bulb and $R$ is its resistance.Assuming the voltage $V$ is constant for all bulbs,we have $R = \frac{V^2}{P}$.This shows that resistance $R$ is inversely proportional to power $P$ $(R \propto \frac{1}{P})$.Therefore,the bulb with the highest power rating will have the lowest resistance.Comparing the given values ($25\, W$,$40\, W$,and $60\, W$),the $60\, W$ bulb has the highest power.Thus,the $60\, W$ bulb has the lowest resistance.

You are given three bulbs of $25\, W$,$40\, W$,and $60\, W$. Which of them has the lowest resistance?

Similar Questions

$A$ $220\, V$ and $800\, W$ electric kettle and three $220\, V$ and $100\, W$ bulbs are connected in parallel. On connecting this combination with a $220\, V$ electric supply,the total current will be ................ $A$.

An electric bulb is designed to draw power $P_0$ at voltage $V_0$. If the voltage is $V$,it draws a power $P$. Then:

Which of the following is not equal to watt?

Electric power is transmitted over long distances through conducting wires at high voltage because

Vedclass Test Series

Exam Paper Generator

Online Exam Module