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The joule ( or sometimes ); symbol J ) is a derived unit of energy, work, or amount of heat in the International System of Units.
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joule and sometimes
Very fine steel wool is sometimes carried for use as tinder in emergency situations ; it burns even when wet and can be ignited by fire, a spark, or by connecting a battery to produce joule heating.
joule and symbol
In physics, the electron volt ( symbol eV ; also written electronvolt ) is a unit of energy equal to approximately joule ( symbol J ).
The joule per mole ( symbol: J · mol < sup >− 1 </ sup >) is an SI derived unit of energy per amount of material.
The SI unit of energy was subsequently named the joule and given the symbol J.
" However, as with gauss and other units, even those derived from names ( watt, joule ) the unit is lower-case when written out, but capitalized as a symbol: tesla, T.
* Foot-pound – ( symbol ft · lbf or ft · lbf ) is an Imperial and U. S. customary unit of mechanical work, or energy, although in scientific fields one commonly uses the equivalent metric unit of the joule ( J ).
joule and J
As seen from the definition, the derived SI units of angular momentum are newton meter seconds ( N · m · s or kg · m < sup > 2 </ sup > s < sup >− 1 </ sup >) or joule seconds ( J · s ).
Thus it is 1 volt ( 1 joule per coulomb, 1 J / C ) multiplied by the electron charge ( 1 e, or ).
Thus, although the joule has the same dimensions as the newton-metre ( 1 J = 1 N · m = 1 kg · m < sup > 2 </ sup >· s < sup >− 2 </ sup >), these units are not interchangeable as the newton-metre ( N · m ) is the unit of torque and joule the unit of energy.
Paraffin wax is an excellent material to store heat, having a specific heat capacity of 2. 14 – 2. 9 J g < sup >− 1 </ sup > K < sup >− 1 </ sup > ( joule per gram kelvin ) and a heat of fusion of 200 – 220 J g < sup >− 1 </ sup >.
The unit of power is the joule per second ( J / s ), known as the watt ( in honor of James Watt, the eighteenth-century developer of the steam engine ).
1 N · m = 1 J ( joule ), the SI unit of energy.
J = joule
In the International System of Units ( SI ), heat capacity is expressed in units of joule ( s ) ( J ) per kelvin ( K ).
The SI unit of energy is the joule ( J ).
The sound energy density is given in J / m < sup > 3 </ sup >, where the joule J
joule and is
It is usually measured in volts, and one volt is the potential for which one joule of work must be expended to bring a charge of one coulomb from infinity.
The unit of measurement for enthalpy in the International System of Units ( SI ) is the joule, but other historical, conventional units are still in use, such as the British thermal unit and the calorie.
The SI unit for specific enthalpy is joule per kilogram.
One gray of radiation is equal to 1 joule of energy absorbed per kilogram of food material.
One joule in everyday life is approximately:
Since the joule is also a Watt-second and the common unit for electricity sales to homes is the kWh ( kilo-Watt-hour ), a kWh is thus 1000 ( kilo ) x 3600 seconds
The SI unit of power is the watt ( W ), which is equal to one joule per second.
The SI unit for energy or work is the joule.
Also, the unit newton metre is dimensionally equivalent to the joule, which is the unit of energy.
The SI unit of energy is the joule.
Additionally, it is the potential difference between two points that will impart one joule of energy per coulomb of charge that passes through it.
* The gray ( Gy ), which has units of ( joules / kilogram ), is the SI unit of absorbed dose, and it is the amount of radiation required to deposit one joule of energy in one kilogram of any kind of matter.
joule and derived
The SI derived unit of energy, the joule, is named after him.
joule and unit
In scientific contexts the Btu has largely been replaced by the SI unit of energy, the joule, though it may be used as a measure of agricultural energy production ( Btu / kg ).
In most fields its use has been replaced by the SI unit of energy, the joule.
Official SI literature suggests using the unit newton metre ( N · m ) or the unit joule per radian.
Coherence was a design aim of SI resulting in only one unit of energy being defined-the joule.
In SI, which is a coherent system, the unit of power is the " watt " which is defined as " one joule per second ".
joule and energy
In a typical lightning strike, 500 joule | megajoules of electric potential energy are converted into 500 megajoules ( total ) of light energy, sound energy, thermal energy, and so on.
Inertial confinement fusion using lasers rapidly progressed in the late 1970s and early 1980s from being able to deliver only a few joule s of laser energy ( per pulse ) to being able to deliver tens of kilojoules to a target.
That is, one joule of electrical energy will cause a resistance heater to produce only one joule of useful heat, while under ideal conditions, one joule of electrical energy can cause a heat pump to move much more than one joule of heat from a cooler place to a warmer place.
joule and work
It is also used less commonly as a unit of work, or energy, in which case it is equivalent to the more common and standard SI unit of energy, the joule.
* James Prescott Joule, English physicist, after whom the SI unit of work, the joule, is named
joule and amount
Since the electrons are free to move in this direction, the polarizer behaves in a similar manner to the surface of a metal when reflecting light ; and the wave is reflected backwards along the incident beam ( minus a small amount of energy lost to joule heating of the wire ).
joule and heat
For example, when water is heated it gains about of mass for every joule of heat added to the water.
Thus, a 21. 5 kiloton ( 9 x 10 < sup > 13 </ sup > joule ) nuclear bomb produces about one gram of heat and electromagnetic radiation, but the mass of this energy would not be detectable in an exploded bomb in an ideal box sitting on a scale ; instead, the contents of the box would be heated to millions of degrees without changing total mass and weight.
As a heating technology, joule heating has a coefficient of performance of 1. 0, meaning that every 1 watt of electrical power is converted to 1 watt of heat.
* a value ratio is arbitrarily assigned ( e. g., a joule of electricity is 2. 6 times more valuable than a joule of heat or fuel input ),
0.111 seconds.