Solution Found!
Answer: A 4-W night-light is plugged into a 120-V circuit
Chapter 23, Problem 7P(choose chapter or problem)
Problem 7P
A 4-W night-light is plugged into a 120-V circuit and operates continuously for 1 year. Find the following: (a) the current it draws, (b) the resistance of its filament, (c) the energy consumed in a year. (d) Then show that for a utility rate of 15¢/kWh the cost for a year’s operation is $5.25.
Questions & Answers
QUESTION:
Problem 7P
A 4-W night-light is plugged into a 120-V circuit and operates continuously for 1 year. Find the following: (a) the current it draws, (b) the resistance of its filament, (c) the energy consumed in a year. (d) Then show that for a utility rate of 15¢/kWh the cost for a year’s operation is $5.25.
ANSWER:
Solution 7P
Given, Power P = 4-W
Potential V = 120- V
(a) Therefore, current I = P/ V
(b) Resistance