What is the difference between a joule and a watt?

Answer 1

A joule is a unit of energy. A watt is a unit of power, which is to say, an amount of energy for a given amount of time. In fact, a watt is defined as one joule per second. Therefore, a 60 watt bulb uses 60 joules of energy for every second it's on.

Besides electricity, joules and watts can be used to describe mechanical energy and power, i.e., the energy of things in motion. A joule is the amount of energy it takes to move an object one meter with a force of one newton. (Think of someone raising a typical apple, which weighs about one newton, one meter.) If you are raising an apple with a string one meter every second, that's about one watt of power.

Long story short---the joule is a unit of energy, and the watt is a unit of energy for a given amount of time.

Answer 2

A joule is a unit of WORK: force X distance.
A watt is a unit of POWER: energy X time:

Answer 3

A watt is an International System unit of power equal to one joule per second.

Joule
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A joule is the work done or energy required to exert a force of one newton for a distance of one metre, so the same quantity may be referred to as a newton metre or newton-metre with the symbol N·m. However, the newton metre is usually used as a measure of work.

As a rough guide, 1 joule is the absolute minimum amount of energy required to lift a one kilogram object up by a height of 10 centimetres on the surface of the Earth.

One joule is also:

The work required to move an electric charge of one coulomb through an electrical potential difference of one volt; or one coulomb volt, with the symbol C·V.
The work done to produce power of one watt continuously for one second; or one watt second (compare kilowatt-hour), with the symbol W·s
Contents [hide]
1 Conversions
2 History
3 SI multiples
4 See also
5 References
6 External link



[edit] Conversions
1 joule is exactly 107 ergs.

1 joule is approximately equal to:

6.24150636309 ×1018 eV (electron-volts)
0.238845896628 cal (calorie) (small calories)
2.390 ×10−4 kilocalorie (food)
9.47817120313 ×10 −4 BTU (British thermal unit)
0.737562149277 ft·lbf (foot-pound force)
23.7 ft·pdl (foot poundals)
2.7778 ×10−7 kilowatt-hour
2.7778 ×10−4 watt-hour
9.8692 ×10−3 litre-atmosphere
Also, some very rough approximations of a joule from the real world are:

the energy required to lift a small apple (102 g) one metre against Earth's gravity.
the amount of energy, as heat, that a quiet person produces every hundredth of a second.
the energy required to heat one gram of dry, cool air by 1 degree Celsius.
1/100th of the energy a person can get by drinking a single droplet of beer.
Units defined in terms of the joule include:

1 thermochemical calorie = 4.184 J (exact)
1 International Table calorie = 4.1868 J (exact)
1 watt-hour = 3600 J (exact)
1 kWh = 1 kilowatt-hour = 3.6×106 J = 3.6 MJ

[edit] History
A joule is the mechanical equivalent of heat meaning the number of units of work in which the unit of heat can perform. Its value was found by James Prescott Joule in experiments that showed the mechanical energy Joule's equivalent, and represented by the symbol J. The term was first introduced by Dr. Mayer of Heilbronn.


[edit] SI multiples
Multiple Name Symbol Multiple Name Symbol
100 joule J
101 decajoule daJ 10–1 decijoule dJ
102 hectojoule hJ 10–2 centijoule cJ
103 kilojoule kJ 10–3 millijoule mJ
106 megajoule MJ 10–6 microjoule µJ
109 gigajoule GJ 10–9 nanojoule nJ
1012 terajoule TJ 10–12 picojoule pJ
1015 petajoule PJ 10–15 femtojoule fJ
1018 exajoule EJ 10–18 attojoule aJ
1021 zettajoule ZJ 10–21 zeptojoule zJ
1024 yottajoule YJ 10–24 yoctojoule yJ

Answer 4

Watts are the name of an electrical flow... but what stuff does the flowing? Energy! A "watt" is just a fancy way of saying "quantity of electrical energy flowing per second." But what is a quantity of electrical energy? I'll get to that in a sec. Any sort of energy is measured in terms of Joules. A joule of electrical energy can move from place to place along the wires. When you transport one joule of energy through a channel every second, the flow-rate of energy is 1 Joule/Sec, and "one Joule per second" means "one watt."

Just like i mentioned a second ago "one Joule per second" means "one watt."

HOPE IT HELPED!

Answer 5

Work is expressed in Joules and power is expressed in Watts.

Answer 6

Joule is unit of work or energy
and watt is the unit of power