A bulb rated 240 V - 100 W is connected to a 120 V supply- What can be inferred-A- The bulb lights up to normal brightnessB- The bulb lights up but it is dimC- The bulb fusesD- The bulb lights up initially and then it fuses

The correct option is B The bulb lights up but it is dim The bulb has a fixed resistance (R =V^2/P). As lower voltage is applied, less power is dissipated, and ...

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard X

Physics

Electric Current and Potential

A bulb rated ...

Question

A bulb rated 240 V, 100 W is connected to a 120 V supply. What can be inferred?

The bulb fuses

No worries! We‘ve got your back. Try BYJU‘S free classes today!

The bulb lights up but it is dim

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

The bulb lights up to normal brightness

No worries! We‘ve got your back. Try BYJU‘S free classes today!

The bulb lights up initially and then it fuses

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is B
The bulb lights up but it is dim

The bulb has a fixed resistance $(R = \frac{V^{2}}{P})$ . As lower voltage is applied, less power is dissipated, and so the bulb glows dim

Suggest Corrections

Similar questions

Q. Three

60 W

light bulbs are mistakenly wired in series and connected to a

120 V

power supply. Assume the light bulbs are rated for single connection to

120 V

. With the mistaken connection, the power dissipated by each bulb is

Q. When the switch was closed in the circuit shown here, the bulbs did not light up.
May be one of the bulbs is fused. How can it be determined which bulb is fused?
figure

(a) Close the switch and notice which bulb does not light up.
(b) Close the switch after removing one bulb at a time until the others light up.
(c) Close the switch and replace the three bulbs with a new one.
(d) There is no way to find out.

Q. A light bulb, a capacitor and a battery are connected together as shown here, with switch

S

initially open. When the switch

S

is closed, which one of the following is true ?

Q. A light bulb is rated at

100 W

for a

220 V

supply. Find the resistance of the bulb:

Q. A light bulb is rated at

100 W

for a

220 V

supply. Find the rms current through the bulb:

Join BYJU'S Learning Program

A bulb rated 240 V, 100 W is connected to a 120 V supply. What can be inferred?

The correct option is B The bulb lights up but it is dim The bulb has a fixed resistance (R=V2P). As lower voltage is applied, less power is dissipated, and so the bulb glows dim

The correct option is B
The bulb lights up but it is dim

The bulb has a fixed resistance $(R = \frac{V^{2}}{P})$ . As lower voltage is applied, less power is dissipated, and so the bulb glows dim