For the following three light bulbs for use in your home, find the current and r
ID: 1429692 • Letter: F
Question
For the following three light bulbs for use in your home, find the current and resistance of each bulb.
Power
Life (hours)
Cost
Incandescent
100W
1500
$0.85
CFL
25W
3500
$1.55
LED
22W
50,000
$11.99
a.)
Calculate the total cost of ownership (TCO) of each bulb assuming that you pay $0.15/kWh. TCO is how much money you spend to buy and use the light bulb for its expected life.
b.)
Calculate how much money you would spend on lighting your home using the three bulbs. How can you compare these three technologies? What light bulb would you recommend using and why?
Power
Life (hours)
Cost
Incandescent
100W
1500
$0.85
CFL
25W
3500
$1.55
LED
22W
50,000
$11.99
Explanation / Answer
a) for Incandescent:
Power consumed = 100 W x 1500 h = 150 kWh
consumption cost = 150 x($ 0.15) = $75
buying cost = $0.85
TCO = 75 + 0.85 = $75.85
for CFL:
Power consumed = 25 W x 3500 h = 87.5 kWh
consumption cost = 87.5 x($ 0.15) = $13.125
buying cost = $1.55
TCO = 13.125 + 1.55 = $14.675
for LED:
Power consumed = 22 W x 50,000 h = 1100 kWh
consumption cost = 1100 x($ 0.15) = $165
buying cost = $11.99
TCO = $176.99
b)
for LED:
per hour cost = 176.99 / 50,000 = $0.00354 = 0.35 cents per hour
for CFL:
per hour cost = 14.675 / 3500 = $0.0042 = 0.42 cents per hour
for Incandescent :
per hour cost = 75.85 / 1500 = $0.0506 = 5.06 cents per hour
SO LED is the best option.
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