Question

you replace a 200 w lamp with a more efficient 55 w led lamp. if you leave your lights on 24 hours a day, how much energy are you saving each day by replacing this bulb?
a. 17,280,000 j
b. 4,752,000 j
c. 21,225,000 j
d. 12,528,000 j

Explanation:

Step1: Calculate power saved

Power saved \( P = 200 - 55=145\ \text{W}\)

Step2: Convert time to seconds

Time \( t = 24\times3600 = 86400\ \text{s}\)

Step3: Calculate energy saved

Using formula \( E=Pt\), \( E = 145\times86400=12528000\ \text{J}\)

Answer:

D. \(12,528,000\ \text{J}\)