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 ...

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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

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The bulb lights up but it is dim

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The bulb lights up to normal brightness

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The bulb lights up initially and then it fuses

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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

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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