You obtain a 100-W light bulb and a 50-W light bulb. Instead of connecting them in the normal way, you devise a circuit that places them in series across normal household voltage. Which statement is correct? a. Both bulbs glow at the same reduced brightness. b Both bulbs glow at the tame increased brightness c. The 100-W bulb glows more brightly than the 50-W bulb d. The 50-W bulb glows more brightly than the 100-W bulb

Question

Ricardo Orozco

Physics

6 September, 20:56

You obtain a 100-W light bulb and a 50-W light bulb. Instead of connecting them in the normal way, you devise a circuit that places them in series across normal household voltage. Which statement is correct? a. Both bulbs glow at the same reduced brightness. b Both bulbs glow at the tame increased brightness c. The 100-W bulb glows more brightly than the 50-W bulb d. The 50-W bulb glows more brightly than the 100-W bulb

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Answers (1)

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Brenton Hobbs · Answer 1

The 50-W bulb glows more brightly than the 100-W bulb

Explanation:

The bulb has a rating of 100 W under 110 V. So it will glow with full brightness when it is fed 110 V. When bulbs are in parallel combination, each bulb receives 110 V. So they glow with full brightness.

When they are in series combination, 110 supply voltage gets distributed between the, thus, reducing the voltage appearing on each of them less than 110 V. So their brightness is reduced.

resistance = V

Bulb having high wattage rating has low resistance resulting in higher current. In the second case, both have same current as they are in series combination. So more heat will be generated in bulb having more resistance. Since 50 W bulb has higher resistance, it will glow brighter than 100 W bulb.