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Q&A: How much power does an HD television use?

Energy use of bulbs, HD TVs

Two questions about electricity: How much electricity does a 37-inch HD television set use per hour, when turned on? And how much electricity does a 60-watt light bulb use per hour when turned on?

For help, we turned to Progress Energy Florida, a subsidiary of Duke Energy. Sterling Ivey, corporate spokesperson, wrote: "The cost to run both is less than 1 cent per hour they are turned on. Actual cost is 0.7 cents under our current residential retail tariff rate ($116.06 per 1,000 kilowatt/hours).

"Incandescent light bulbs that have been around since Edison, are rated by their power dissipation (or energy use). Although not very efficient for the ratio of power to light relative to fluorescents and LEDs (most of the energy is converted to heat, not light) the labeling is quite instructive.

"A 60-watt incandescent bulb uses 60 watts of energy; we bill for energy in kilowatt hours which is 1,000 watts continuously for 1 hour. So, a 60-watt bulb uses 60 watts hours or .06 kilowatt hours of energy for each hour it's on. The bulb would use 1 kilowatt hour in just less than 17 hours if left on continuously; around 12 cents in our current tariff for most residential customers.

"A CFL or LED bulb uses less than 25 percent of the energy for the same light output as the 60-watt incandescent; a big opportunity for substantial savings as they can run continuously for about 70 to 100 hours for the same cost of energy.

"The HD TV is a bit more difficult to compute, as there is a wide range of consumption possible based on technologies and features. The best advice to consumers is to always look at the Energy Guide yellow sticker attached to each model (or visit ftc.gov/energy).

"For purposes of the question, we looked at a standard LED model that is rated at '$13.4' yearly cost; that means it uses 122 kilowatt hours per year when operated 5 hours a day, or 67 watts.

"The 60-watt incandescent light bulb uses about the same energy as one of the better LED HD 37-inch TVs; that means they cost about the same when turned on. Of course the TV is never really off, unless you unplug it or put it on a power strip; it uses a watt or 2 to run the circuit to look for commands from the remote control.

"Suffice to say that the consumer has many choices when selecting TVs or light bulbs that can significantly impact their energy use and thus their bill."

Flying to the moon

What is the distance from the Earth to the moon, and how long does it take to get there?

The moon takes an elliptical path around Earth, but on average, it's 238,855 miles away, according to NASA. It's 225,623 miles away at its closest, and 252,088 miles away at its farthest. NASA's New Horizons mission to Pluto flew past the moon just eight hours and 35 minutes after leaving Earth in 2006.

Q&A: How much power does an HD television use? 04/21/13 [Last modified: Friday, April 19, 2013 1:45am]
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