Two bulbs rated 25 W - 220 V and 100 W - 2 | vedclass

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

Question

(B) The resistance of a bulb is given by $R = \frac{V^2}{P}$.For the first bulb: $R_1 = \frac{220^2}{25} = 1936 \ \Omega$.For the second bulb: $R_2 =

Vedclass · Accepted Answer

$25 \ W$ bulb fuses

Vedclass · Answer

(B) The resistance of a bulb is given by $R = \frac{V^2}{P}$.For the first bulb: $R_1 = \frac{220^2}{25} = 1936 \ \Omega$.For the second bulb: $R_2 = \frac{220^2}{100} = 484 \ \Omega$.Since the bulbs are connected in series,the total resistance is $R_{net} = R_1 + R_2 = 1936 + 484 = 2420 \ \Omega$.The current flowing through the circuit is $I = \frac{V_{supply}}{R_{net}} = \frac{440}{2420} = \frac{2}{11} \ A$.The potential difference across the $25 \ W$ bulb is $V_1 = I 	imes R_1 = \frac{2}{11} 	imes 1936 = 352 \ V$.The potential difference across the $100 \ W$ bulb is $V_2 = I 	imes R_2 = \frac{2}{11} 	imes 484 = 88 \ V$.Since the potential difference across the $25 \ W$ bulb $(352 \ V)$ exceeds its rated voltage $(220 \ V)$,the $25 \ W$ bulb will fuse.

Two bulbs rated $25 \ W - 220 \ V$ and $100 \ W - 220 \ V$ are connected in series to a $440 \ V$ supply. Which of the following happens?

Similar Questions

Suppose there is a circuit consisting of only resistances and batteries. Suppose one is to double (or increase it to $n$-times) all voltages and all resistances. Show that currents are unaltered.

$A$ $3\,V$ battery with negligible internal resistance is connected in a circuit as shown in the figure. The current $I$ in the circuit will be ............. $A$.

$A$ $DC$ source with internal resistance $R_0$ is connected to three identical resistors each of resistance $R$ as shown in the figure. If the thermal power generated in the circuit is highest,then

Three identical bulbs $B_1, B_2$ and $B_3$ are connected to the mains as shown in the figure. If $B_3$ is disconnected from the circuit by opening switch $S$,then the incandescence of bulb $B_1$ will

In the given circuit,the potential of the point $E$ is

Vedclass Test Series

Exam Paper Generator

Online Exam Module