Question

Some light bulbs have three power settings (not including zero), obtained from multiple filaments that are individually switched and wired in parallel. What is the minimum number of filaments needed for three power settings?

a) 1

b) 2

c) 3

d) 4

Answer 1

The minimum number of filaments needed for three power settings in a light bulb is 3.

Step-by-step explanation:

In order to have three power settings in a light bulb, we need to have three different filaments. Each filament corresponds to a different power setting. These filaments are individually switched and wired in parallel. So, the minimum number of filaments needed for three power settings is 3 (option c).