- published: 30 Nov 2011
- views: 41479
The kilowatt hour (symbol kWh, kW·h, or kW h) is a derived unit of energy equal to 3.6 megajoules. If the energy is being transmitted or used at a constant rate (power) over a period of time, the total energy in kilowatt-hours is the product of the power in kilowatts and the time in hours. The kilowatt-hour is commonly used as a billing unit for energy delivered to consumers by electric utilities.
The kilowatt-hour (symbolized kW⋅h) is a unit of energy equivalent to one kilowatt (1 kW) of power sustained for one hour.
One watt is equal to 1 J/s. One kilowatt-hour is 3.6 megajoules, which is the amount of energy converted if work is done at an average rate of one thousand watts for one hour.
Note that the international standard SI unit of energy is the joule. The hour is a unit of time "outside the SI", so the kilowatt-hour is a non-SI unit of energy. It is not listed among the non-SI units accepted by the BIPM for use with the SI.
An electric heater rated at 1000 watts (1 kilowatt), operating for one hour uses one kilowatt-hour (equivalent to 3.6 megajoules) of energy. A television rated at 100 watts operating for 10 hours continuously uses one kilowatt-hour. A 40-watt light bulb operating continuously for 25 hours uses one kilowatt-hour.
The watt (symbol: W) is a derived unit of power in the International System of Units (SI), named after the Scottish engineer James Watt (1736–1819). The unit is defined as joule per second and can be used to express the rate of energy conversion or transfer with respect to time. It has dimensions of L2MT−3.
When an object's velocity is held constant at one meter per second against constant opposing force of one newton the rate at which work is done is 1 watt.
In terms of electromagnetism, one watt is the rate at which work is done when one ampere (A) of current flows through an electrical potential difference of one volt (V).
Two additional unit conversions for watt can be found using the above equation and Ohm's Law.
Where ohm () is the SI derived unit of electrical resistance.
Houston Texans defensive end J.J. Watt is as entertaining on the mic as he is intimidating on the field. Check out what he had to say throughout his Week 13 matchup against the Tennessee Titans in 2014.
ESPN First Take Today 9-28-16 Stephen A. Smith and Max Kellerman. Houston Texans' J.J. Watt Re-Injures Back Houston Texans' J.J. Watt Re-Injures Back Houston Texans' J.J. Watt Re-Injures Back
Every NFL fan knows how great J.J. Watt is on the field of play, but few really understand how ridiculous athletic he is and what it takes for him to maintain his powerful physique. We break down everything J.J. Watt, from his unmatched on-the-field stats to how many cheeseburgers it would take to have a comparable 9,000 calorie diet!
Subscribe for more sports coverage ►► http://bit.ly/SubToFumble Cam Newton Decks Guy In The Face With A Football ►► http://obsev.it/Cam_Football_Face Watch Russell Wilson's Leg Bend Out Gruesomely ►► http://obsev.it/Russell_Leg_Injury Bad news Texans fans, JJ Watt has injured his back once again. Watt will miss an extended period of the regular season, possibly the whole thing. This injury comes just two months after J.J. had back surgery. For the latest in sports - Check out our site: http://www.obsev.com/sports Like us on Facebook: https://www.facebook.com/TheFumble/ Follow us on Twitter: https://twitter.com/FumbleSports Find us on Instagram: https://www.instagram.com/thefumblesports/
Colin Cowherd thinks that Houston Texans star J.J. Watt is a Hall of Famer. Here is his argument. ---MORE NFL COVERAGE FROM FOX SPORTS-- Will the Cowboys' Dak Prescott pull a Tony Romo on Tony Romo? - http://www.foxsports.com/nfl/story/dallas-cowboys-dak-prescott-tony-romo-quarterback-controversy-092716 Cowboys' Cole Beasley loves the viral video of the crushing hit he took vs. Bears - http://www.foxsports.com/nfl/story/cowboys-cole-beasley-loves-the-viral-video-of-the-crushing-hit-he-took-vs-bears-092716 Dez Bryant undergoes MRI on knee as Cowboys await results - http://www.foxsports.com/nfl/story/dez-bryant-undergoes-mri-on-knee-as-cowboys-await-results-092616 --------------------------------------------------------------------------------------------------------- SUBSCRIBE to get the l...
Redeem your free trial for The Great Courses Plus: http://ow.ly/Py3T304920R Mass is a challenging concept to tie down, yet it is one of the most crucial measurements in our world. Since the 1800's, we've used a physical artifact as a standard for mass calibration across the world. Within the next few years, that will all change because of this ingenious device: the watt balance. Links: -NIST Lego Watt Balance: http://scitation.aip.org/content/aapt/journal/ajp/83/11/10.1119/1.4929898 -Building the Desktop Watt Balance: [Coming soon!] -Watt Balance Technical Drawing Timelapse: [Coming soon!] -Patreon: http://patreon.com/PracticalEngineering -Website: http://practical.engineering -Music: Elexive - Tonic and Energy (https://www.youtube.com/watch?v=U6fBPdu8w9U)
JJ Watt and his crew hit the streets to teach a random Gatorade drinker that the sugar in Gatorade isn’t just for taste. It provides quick, accessible energy for athletes. Unfortunately, this guy had to learn that the hard way. #BurnItToEarnIt
Amazon-US: http://eita.us/slus/2/com/B0095BTGPA/info The Gy series Mini Studio Flash is a 150 watt/second strobe monolight. Use it for a hair light, background or even as a main in a small lighting set up. It operates on 110 Ac voltages, recycles in 0.5-3 seconds, and at a variable range. It has a 50w modeling lamp that can be switched on or off depending on requirements. The features a test button, sync cable, control, and infra red trigger option. The mounts to most stands and comes with a bracket with built-in umbrella holder. The also offers precise aiming by changing the tilt angle.specifications:max. Power: Modelling Lamp: 50wpower variation: Step-less adjustmentgn: 36inner fan: Nocolor Temperature: 5500 degrees +/-200k Time: 0.7-3s and controlfuse: 5a
A shack / mobile field test of the new updated Leixen VV898E radio, not be confused with its lower power sibling the VV898 without the E, I put it throught the power meter and listen and compare to it on the SDR. This radio can be had for about £55 if you shop around, be careful to ensure that get the 25W version and not the 10W version of the radio, although the 10W version of the radio is cheaper.
This is very nice video
Conscientous objector the lowest of their kind!
Watching while their brothers die sworn to selfish mind!
Sell mothers to horrid fate to save your world from war!
Turning cheek, spineless weak, peace you must implore!
(chorus):
To underminde the very things that our forefathers died for!
Is slow decay of freedom's way unlock that tyrant's door!
Meet force with force have no remorse if time come you must fight!
Defend defend until the end your freedom wrong or right!
Bring yourself to life; an ugly though to bare!
Us or them then where's the sin; conscience cleared of care!
Able bodied sound of mind, in war it's fair they say!
Justify your train of thought; truly there's no way!
(Chorus)
Silent protester won't stop fires burning down your world!
In the end you've proved your point as slavery unfuried!
Priorities yours to make, defense dignity!
Those you kill would do the same! preserve your liberty!