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Answer: A 4-W night-light is plugged into a 120-V circuit

Chapter 23, Problem 7P

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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.

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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

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