Question

Choose the correct alternative.

You are given four bulbs of 25 W, 40 W, 60 W, and 100 W of power, all operating at 230 V. Which of them has the lowest resistance?

Options

• 25 W

• 40 W

• 60 W

• 100 W

Answer 1

100 W

Explanation:

P = `"V"^2/"R"`

Since all the bulbs are operating at the same volt.

P α`1/"R"`

∴ The bulb with the highest power will have the lowest resistance. i.e., 100 W bulb