Homework SourseA 120V power line is protected by a 15Afuse What is the maxi
A 120-V power line is protected by a 15-Afuse. What is the maximum number of \"120V, 100W\" light bulbs that can be operated at full brightness from this line? 12 6 3 2 1 ![A 120-V power line is protected by a 15-Afuse. What is the maximum number of \](/WebImages/43/a-120v-power-line-is-protected-by-a-15afuse-what-is-the-maxi-1132665-1761605453-0.webp "A 120-V power line is protected by a 15-Afuse. What is the maximum number of \")
Solution
We know
Pmax = VI = 120 * 15 = 1800 Watt
One light bulb to operate at full brightness requires 100 W. There fore 18 bulbs can be operated. But in given options 12 the max number.
Also for a given bulb, I = P/V = 100/120 = 5/6 A and the fuse rating is 15 A. So 18 bulb can with stand in given fuse rating as (5/6) * 18 = 15 A.
