Which has a greater resistance-a 100 W bulb o | vedclass

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

Question

(B) The power rating of a bulb is given by the formula $P = V^2 / R$,where $P$ is power,$V$ is voltage,and $R$ is resistance.Assuming both bulbs are d

Vedclass · Accepted Answer

$60$ $W$ bulb

Vedclass · Answer

(B) The power rating of a bulb is given by the formula $P = V^2 / R$,where $P$ is power,$V$ is voltage,and $R$ is resistance.Assuming both bulbs are designed for the same voltage $V$,the resistance is inversely proportional to the power $(R = V^2 / P)$.For a $100$ $W$ bulb,$R_1 = V^2 / 100$.For a $60$ $W$ bulb,$R_2 = V^2 / 60$.Since $60  V^2 / 100$,which means $R_2 > R_1$.Therefore,a $60$ $W$ bulb has a greater resistance.

Which has a greater resistance$-$a $100$ $W$ bulb or a $60$ $W$ bulb?

Similar Questions

Five bulbs are connected in a parallel circuit. If the second bulb blows out,what happens?

Three $V-I$ graphs are drawn individually for two resistors and their series combination. Out of $A, B, C$,which one represents the graph for the series combination of the other two? Give a reason for your answer.

Define current. Give its $SI$ unit.

In an experimental set-up as shown below,a piece of silver was placed touching points $A$ and $B$. Next time it was replaced by a piece of wood. In which case did the bulb glow? Give reason to justify the observation.

An electric appliance draws a current of $0.4\, A$ when the voltage is $200\, V$. Calculate the amount of charge flowing through it in one hour.

Vedclass Test Series

Exam Paper Generator

Online Exam Module