- published: 30 Nov 2011
- views: 41479
A watt second (also watt-second, symbol W s or W·s) is a derived unit of energy equivalent to the joule. The watt-second is the energy equivalent to the power of one watt sustained for one second. While the watt-second is equivalent to the joule in both units and meaning, there are some contexts in which the term "watt-second" is used instead of "joule".
The kilowatt hour (kWh) is equivalent to 3,600,000 watt-seconds and is a unit used in the electricity market, and by producers of electricity.
Although joule and watt-second mean exactly the same thing (they represent the same amount of the same physical quantity, viz. energy), the newton metre is not equivalent to the joule (despite having the same dimensions) as it represents torque rather than energy. (In terms of vectors, torque is a cross product of force and distance, and energy is their dot product.)
In photography, the unit for flashes is the watt-second. A flash can be rated in watt-seconds (e.g. 300 Ws) or in joules (different names for the same thing), but historically the term "watt-second" has been used and continues to be used. An on-camera flash, using a 1000 microfarad capacitor at 300 volts, would be 45 watt-seconds. Studio flashes, using larger capacitors and higher voltages, are in the 200 - 2000 watt-second range.
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
[Intro:]
Straight out of QB niggas
This is nas, lo
With my braveheart niggas
Jungle, wiz and horse
fuckin with these cash money millionaires
so what yall gonna do about that
niggas
[Hook:]
We on your block
We got rocks
You got robbed
The man got shot
That nigga's dead
Come get revenge
We getting money
We in the benz
We drive cars
We fuck your hoes
We taking charge
We gettin dough
Yall niggas pussy
I cut your face
I'm in your hood
Every fucking day
[Verse One: Wiz]
Yeah What up nigga im back
Fuck you got the mac
Touch you and them niggas you with
The bigger your clique the bigger my clip
The bigger my gun them niggas im with is horse and jung
And of course youll become a corpse if you fucking with me
The 44 caliber killer don't tussle with me
I been to war couple of times slept in the cold
Shed tears seen it all been outside for years
What this life mean to yall?
Money ice and cars Bustin nuts in broads
Never trusting god
You better trust him had with you when you hustlin
It was him that kept me alive when niggas was bustin
He aint gonna save you so when I AK you and spray you
I run in your spot and take all whats yours
So you lay on the floor we expanding
What you gonna to do about it nigga?
Not a damn thing
[Hook:]
We on your block
We got rocks
You got robbed
The man got shot
That nigga's dead
Come get revenge
We getting money
We ridin in the benz
We drive cars
We fuck your hoes
We taking charge
We get the dough
Yall niggas pussy
We cut your face
We in your hood
Every fucking day
[Verse 2a]
What the fuck yall was born brave?
I put a slug through your cornbraids
Summertime broad day
You get your face blown right at the pay phone
I got big guns that break bones
Beef with me you take home to your family
Bullets fly randomly
Wet you like hard rain
Bravehearts gangbang
[Verse 2b: Nas]
Yo last night it was on Niggas came pistols drawn
Poppin off I had to run they shot one the kid is gone
niggas quick to get it on know the block im living on
queens bridge murders kings live merciless
heartless crazy mercedes the projects young killas OG's enemies targets
blow weed henessee more beef let it be
no chance of wetting me I hold heat in the streets
rolls royce drop top crusing where the women be
last nigga fucked around hes a hood memory
fresh nikes wife beater knicks jersey white sneakers
heavy like an ice freezer deadly not nice either
ill fuck the hoe with pussy that's mind blowing
do my thug dance in clubs with my nine showing
niggas tell they hoes, "why you fucking with nas?
He just gonna nut on your eyes
have you suck all his guys
and also he say when you done cussin his by"
you aint thuggin you lie bitch
brave till we die bitch
[Verse 2c: Horse]
?? a nigga that would kill something over something small
the one you cant ??? with unless you paid in full
the one that hold grudges cause gun games for free
the only thing you wetting and splittin is ??
im the one that lift the skirts up on fake ass rappers
that be killin for a long time but now it don't happen
all them tough guys is wanksters they ?? me in their songs
im a braveheart till death so I got to die strong
a big man that's troublesome and follow no rules
run through crews after smoking blunts and sippin on brews
disrespecter pistol whippin hustlers for their cheddar
the deebo of the rap game but walk with a beretta
my heart is made of stone my eyes is filled with blood
survivors of the street wars yall niggas know whats up
from the projects to penthouse yall niggas better look out
before these braveheart motherfuckers put they gun in your mouth
[Hook:]
We on your blocks
We got glocks
You get robbed
The man get shot
That nigga's dead
Come get revenge
We getting money
We ridin in the benz
We drive cars
We fuck your hoes
We taking charge
We gettin dough
Yall niggas pussy
We cut your face
We in your hood
Every fucking day
[Shit talking at end:]
We in your hood
Every fucking day niggas
Every day niggas, huh
Look around niggas
We on top
What you gonna do about it nigga?
What you got to say about it nigga?
That's right
That's right
Run all over yall niggas
What yall gonna do about it? Nothin
Bunch of corny ass phony ass niggas
Get brave nigga we brave nigga (bravehearts!)
Brave to the death baby