How do you convert kilowatt hours to joules?
Joules to kWh conversion How to convert kWh to joules. One kilowatt-hour is equal to 3600000 joules: 1kWh = 3600000J = 3.6⋅10 6 J = 3.6MJ. So the energy in joules E (J) is equal to 3600000 times the energy in kilowatt-hour E (kWh):. E (J) = 3600000 ⋅ E (kWh). kWh to joules conversion table
How many kilowatt are in 1 joule?
To transform 1 Joule into kilowatt-hour, you just need to multiply the quantity in Joules by the conversion factor, 3600000. So, 1 Joule in kilowatts-hour = 1 times 3600000 = 2.77777777778e-7 kilowatt-hour, exactly. See details on the formula below on this page.
How to convert watts to kilojoules?
You can calculate kilojoules from watts and seconds, but you can't convert watts to kilojoules since watt and kilojoule units represent different quantities. Watts to kJ calculation formula The energy E in kilojoules (kJ) is equal to the power P in watts (W), times the time period t in seconds (s): E(kJ) = P(W) × t(s) / 1000 So
How many kilojoules are equivalent to 10 joules?
The kilojoule (kJ) is equal to one thousand (10 3) joules. Nutritional food labels in most countries express energy in kilojoules (kJ). One square metre of the Earth receives about 1.4 kilojoules of solar radiation every second in full daylight. What is the formula for joules? Joule – Energy Unit.
What is 1 watt equal to in terms of joules?
1 Joule per secondPower in general is defined as energy over time. Watts are defined as 1 Watt = 1 Joule per second (1W = 1 J/s) which means that 1 kW = 1000 J/s.
What is 1kg watt?
1 kg-m/s is equal to 9.80665 watt.
What is the value of 1 watt?
1.00 J/sThe 1 W unit measure equals to 1.00 J/s as the equivalent measure for the same power type. Energy is measured in Joules while power is measured in watts. 1 watt is defined as 1 joule/sec. The joules per second unit number 1.00 J/s converts to 1 watt.
How do you convert kg to J?
The equivalence of mass and energy is derived from the famous Einstein's equation E = mc² where E is energy, m is mass and c = 299 792 458 m/s is the speed of light. That is, 1 kilogram of mass is equal to 8.98·10¹⁶ joules of energy or (1 J)/c² = 1.112 650 056 × 10⁻¹⁷ kg.
Is a watt equal to a joule?
watt, unit of power in the International System of Units (SI) equal to one joule of work performed per second, or to 1/746 horsepower.
How many watts is 1kwh?
1,000 wattsA kilowatt-hour is 1,000 watts used for one hour. As an example, a 100-watt light bulb operating for ten hours would use one kilowatt-hour. Below are some examples of electrical appliances found in most homes. These examples are using a 10 cents per kWh rate.
What is the value of 1 joule?
1 joule➙ The amount of energy exerted when a force if 1 N is applied over a displacement of 1 m. ❖ 1 joule is equal to 1 wattof power radiated for one second is the unit of energy. ❖ The millijoules unit number 1,000.00 mJ converts to 1 J, one joule.
How many joules are there in 1 kilo watt-hour?
3.6×106 JoulesComplete answer: Kilo-watt hour is a unit of energy used to denote the energy consumption of large machinery and the electricity consumption in homes and industries. It is also a common unit representation in electrical power engineering. So, one 1KWh contains 3.6×106 Joules.
How many joules is 1000 watts?
Watt to Joule/second Conversion TableWatt [W]Joule/second [J/s]20 W20 J/s50 W50 J/s100 W100 J/s1000 W1000 J/s7 more rows
What is a joule in KG?
How to Convert Joule to Kilogram-force Meter. 1 J = 0.1019716213 kilogram-force meter. 1 kilogram-force meter = 9.8066499997 J. Example: convert 15 J to kilogram-force meter: 15 J = 15 × 0.1019716213 kilogram-force meter = 1.5295743195 kilogram-force meter.
How do you convert kg to energy?
This implies, for instance, that 1 kilogram of matter is equivalent to an energy E = (1 kg)×(3×108 m/sec)2 = 9×1016 kg m2/sec2. An energy of 1 kg m2/sec2 is known as 1 joule, for short.
Overview
Energy is a notion central to physics, chemistry, physiology, and life itself. Neither life nor motion is possible without energy. In physics it is defined as the property of objects or fields, which allows it to perform work on other objects, for example to cause motion. The SI unit for energy is a joule.
Energy in Physics
Kinetic energy of a body with mass m moving with the speed v is equal to the work that a force needs to complete in order to accelerate the body from its rest state to the speed v. Here, work is defined as the amount of force needed to move the body over the distance s. In other words it is the energy of a moving body.
Generating Energy
Potential and kinetic energy can be used to perform work, such as putting objects in motion. Humans have used this principle to accomplish numerous difficult tasks with the help of various devices and machines. For example, the kinetic energy of moving water was used for many centuries to move water mills that produce flour.
Renewable Energy
Other alternatives include using renewable power sources, such as energy from waves, sunlight, and wind. At the moment these alternative sources are not developed enough to replace fossil fuels.
Energy in Nutrition and Exercise
Energy in nutrition and exercise is usually measured in kilojoules or food calories. One food calorie is equivalent to one kilocalorie or 1000 calories in the scientific notation. This is about 4.2 kilojoules.
How many watts is a kilowatt?
The kilowatt (kW) is equal to one thousand (10 3) watts. This unit is typically used to express the output power of engines and the power of electric motors, tools, machines, and heaters. It is also a common unit used to express the electromagnetic power output of broadcast radio and television transmitters .
What is a watt in electrical terms?
In terms of electromagnetism, one watt is the rate at which electrical work is performed when a current of one ampere (A) flows across an electrical potential difference of one volt (V), meaning the watt is equivalent to the volt-ampere (the latter unit, however, is used for a different quantity from the real power of an electrical circuit). ...
How many watts does a laser pointer use?
The milliwatt (mW) is equal to one thousandth (10 −3) of a watt. A typical laser pointer outputs about five milliwat ts of light power, whereas a typical hearing aid for people uses less than one milliwatt. Audio signals and other electronic signal levels are often measured in dBm, referenced to one milliwatt.
How many megawatts are in a GW?
The gigawatt (GW) is equal to one billion (10 9) watts or 1 gigawatt = 1000 megawatts. This unit is often used for large power plants or power grids. For example, by the end of 2010, power shortages in China's Shanxi province were expected to increase to 5–6 GW and the installed capacity of wind power in Germany was 25.8 GW. The largest unit (out of four) of the Belgian Doel Nuclear Power Station has a peak output of 1.04 GW. HVDC converters have been built with power ratings of up to 2 GW.
How many watts does it take to climb a ladder?
A person having a mass of 100 kilograms who climbs a three-metre-high ladder in five seconds is doing work at a rate of about 600 watts. Mass times acceleration due to gravity times height divided by the time it takes to lift the object to the given height gives the rate of doing work or power.
How much is an attowatt?
The attowatt (aW) is equal to one quintillionth (10 −18) of a watt. The sound intensity in water corresponding to the international standard reference sound pressure of 1 μPa is approximately 0.65 aW/m 2.
When an object's velocity is held constant at one metre per second against a constant opposing force of one
When an object's velocity is held constant at one metre per second against a constant opposing force of one newton, the rate at which work is done is one watt.
How many joules per second is one watt?
Exactly 1 Joules per second equal one Watt. This comes from the definition of the Watt, which is a unit of power used to quantify the rate of energy transfer. In the International System of Units (SI) it is defined as a derived unit of 1 Joule per second [1] with a symbol W.
What is the difference between joules and watts?
Difference between Joules and Watts. Joules are units of energy while Watts are units of power, but there is often confusion about the difference between the terms power and energy. Power is the rate of delivery of energy - work performed per unit of time. On the other hand, energy is the work performed over a period of time.
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Overview
Energy in Physics
- Kinetic versus Potential Energy
Kinetic energy of a body with mass m moving with the speed v is equal to the work that a force needs to complete in order to accelerate the body from its rest state to the speed v. Here, work is defined as the amount of force needed to move the body over the distance s. In other words it i…
Generating Energy
- Potential and kinetic energy can be used to perform work, such as putting objects in motion. Humans have used this principle to accomplish numerous difficult tasks with the help of various devices and machines. For example, the kinetic energy of moving water was used for many centuries to move water mills that produce flour. As more and more people use technology like …
Renewable Energy
- Other alternatives include using renewable power sources, such as energy from waves, sunlight, and wind. At the moment these alternative sources are not developed enough to replace fossil fuels. However, thanks to the subsidies provided by some governments, and also because these energy sources are much less harmful to the environment than the non-renewable ones, they ar…
Energy in Nutrition and Exercise
- Calories in Nutrition
Energy in nutrition and exercise is usually measured in kilojoules or food calories. One food calorie is equivalent to one kilocalorie or 1000 calories in the scientific notation. This is about 4.2 kilojoules. One food calorie is formally defined as the amount of energy needed to raise the tem… - Calories in Exercise
Energy used by the human body is needed to maintain the basal metabolic rate (BMR), which constitutes the amount of energy needed to support a living body at rest. This includes supporting the metabolism of the brain, as well as of the other organs and tissues. It is also used to suppor…
Overview
The joule is a derived unit of energy in the International System of Units. It is equal to the amount of work done when a force of 1 newton displaces a mass through a distance of 1 metre in the direction of the force applied. It is also the energy dissipated as heat when an electric current of one ampere passes through a resistance of one ohm for one second. It is named after the English physicist James Prescott Joule (1818–1889).
Conversions
1 joule is equal to (approximately unless otherwise stated):
• 10 erg (exactly)
• 6.24150974×10 eV
• 0.2390 cal (gram calories)
• 2.390×10 kcal (food calories)
Definition
In terms firstly of base SI units and then in terms of other SI units, a joule is defined as
One joule can also be defined by any of the following:
• The work required to move an electric charge of one coulomb through an electrical potential difference of one volt, or one coulomb-volt (C⋅V). This relationship can be used to define the volt.
• The work required to produce one watt of power for one second, or one watt-second (W⋅s) (comp…
History
The cgs system had been declared official in 1881, at the first International Electrical Congress. The erg was adopted as its unit of energy in 1882. Wilhelm Siemens, in his inauguration speech as chairman of the British Association for the Advancement of Science (23 August 1882) first proposed the Joule as unit of heat, to be derived from the electromagnetic units Ampere and Ohm, in cgs units equivalent to 10 erg. The naming of the unit in honour of James Prescott Joule (1818…
Practical examples
One joule represents (approximately):
• The amount of electricity required to run a 1 W device for 1 s.
• The energy required to accelerate a 1 kg mass at 1 m/s through a distance of 1 m.
• The kinetic energy of a 2 kg mass travelling at 1 m/s, or a 1 kg mass travelling at 1.41 m/s.
Multiples
Yoctojoule The yoctojoule (yJ) is equal to 10 joule. Zeptojoule The zeptojoule (zJ) is equal to one sextillionth (10 ) of one joule. 160 zJ is about one electronvolt. The minimal energy needed to change a bit at around room temperature – approximately 2.75 zJ – is given by the Landauer limit. Attojoule The attojoule (aJ) is equal to 10 joule. Femtojoule The femtojoule (fJ) is equal to 10 joule. Picojoule The picojoule (pJ) is equal to one trillionth (10 ) of one joule. Nanojoule The n…
Newton-metre and torque
In mechanics, the concept of force (in some direction) has a close analogue in the concept of torque (about some angle):
A result of this similarity is that the SI unit for torque is the newton-metre, which works out algebraically to have the same dimensions as the joule, but they are not interchangeable. The General Conference on Weights and Measures has given the unit of energy the name joule, but ha…
Watt-second
A 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".
In photography, the unit for flashes is the watt-second. A flash can be rated in watt-seconds (e.g.…
Summary
The watt (symbol: W) is a unit of power or radiant flux. In the International System of Units (SI), it is defined as a derived unit of (in SI base units) 1 kg⋅m ⋅s or, equivalently, 1 joule per second. It is used to quantify the rate of energy transfer. The watt is named after James Watt (1736–1819), an 18th-century Scottish inventor.
Distinction between watts and watt-hours
The terms power and energy are closely related but distinct physical quantities. Power is the rate at which energy is generated or consumed and hence is measured in units (e.g. watts) that represent energy per unit time.
For example, when a light bulb with a power rating of 100W is turned on for one hour, the energy used is 100 watt hours (W·h), 0.1 kilowatt hour, or 360 kJ. This same amount of energy would ligh…
Overview
When an object's velocity is held constant at one metre per second against a constant opposing force of one newton, the rate at which work is done is one watt.
In terms of electromagnetism, one watt is the rate at which electrical work is performed when a current of one ampere (A) flows across an electrical potential difference of one volt (V), meaning the watt is equivalent to the volt-ampere (the latter unit, however, is used for a different quantity fro…
Origin and adoption as an SI unit
The watt is named after the Scottish inventor James Watt. The unit name was proposed initially by C. William Siemens in August 1882 in his President's Address to the Fifty-Second Congress of the British Association for the Advancement of Science. Noting that units in the practical system of units were named after leading physicists, Siemens proposed that watt might be an appropriate name for a unit of power. Siemens defined the unit consistently within the then-existing system …
Multiples
The yoctowatt (yW) is equal to one septillionth of a watt (10 W).
The zeptowatt (zW) is equal to one sextillionth of a watt (10 W).
The attowatt (aW) is equal to one quintillionth of a watt (10 W). The sound intensity in water corresponding to the international standard reference sound pressure of 1 μPa is approximately 0.65 aW/m .
Conventions in the electric power industry
In the electric power industry, megawatt electrical (MWe or MWe ) refers by convention to the electric power produced by a generator, while megawatt thermal or thermal megawatt (MWt, MWt, or MWth, MWth) refers to thermal power produced by the plant. For example, the Embalse nuclear power plant in Argentina uses a fission reactor to generate 2109 MWt (i.e. heat), which creates steam to drive a turbine, which generates 648 MWe (i.e. electricity). Other SI prefixes are someti…
Radio transmission
Radio stations usually report the power of their transmitters in units of watts, referring to the effective radiated power. This refers to the power that a half-wave dipole antenna would need to radiate to match the intensity of the transmitter's main lobe.
See also
• Kibble balance (formerly known as a watt balance)
• Nominal power (photovoltaic)
• Power factor
• Solar constant