Question

one deterrent to burglary is to leave your front porch light on all the time if your fixture contains the 23 watt compact fluorescent bulb at 120 volts and your local power utility cell's energy at ten cents per kilowatt-hour how much will it cost to leave the bulb on for the entire month

Answer 1

Answer:

Cost = 165.6 cents = $1.656

Explanation:

First, we will calculate the total energy consumed by the bulb in a month:

$E=Pt$

where,

E = Energy Consumed = ?

P = power = 23 W

t = time = (1 month)(30 days/1 month)(24 h/1 day) = 720 h

Therefore,

$E = (23\ W)(720\ h)\\E = 16560\ Wh = 16.56\ Kilowatt-hour$

Now, the cost will be:

$Cost = P(Unit\ Cost)\\Cost = (16.56\ kilowatt-hour)(10\ cents/kilowatt-hour)$

Cost = 165.6 cents = $1.656