2 years, 10 months ago
What is the difference between a Joules and a BTU?
What does each type of unit describe?
What is the difference between power and energy?
What is the difference between power and energy?
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M$1 Answer
The difference between a Joule and a BTU:
1 joule is equal to 0.000948451382809 Btu thermochemical.
Definition of each type of unit:
* The Joule (symbol J, also called Newton meter, Watt second or Coulomb volt) is the SI unit of energy and work. The unit is named in honor of the physicist James Prescott Joule (1818-1889).
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.
* The British thermal unit (BTU or Btu) is a non-metric unit of energy, used in the United States and, to a lesser extent, the UK (where it is generally only used for heating systems). The SI unit is the joule (J), which is used by most other countries.
According with "www.associatedcontent.com" on the August 05, 2008 article "Physics 101: What is the Difference between Energy and Power?" by Gary Transmeier:
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Energy is defined as the ability to do work. This is a common and general description of energy. Another view, it takes energy to do anything. Energy is needed to move your car. Energy is needed to heat your home. Energy is needed to light the night. So on and so on. A value can be placed on this energy by using the English unit called Btu or the Metric unit called Joule. A gallon of gasoline has 125,000 Btu. Whether you drive a Honda Fit or a Lincoln Navigator, a gallon of gas has the same energy. When discussing consumption or use, then energy terms are used.
The joule is not used in common media. Another term, the watt-hour (w-h) or kilowatt hour (kWh) is used. A kilowatt is 1000 watts. Your home may have used 1100 kWh last month; this is energy. The reason the joule is not often used is because one joule is a small amount of energy. It takes 3.6 million joules to equal one kWh. The problem with kWh is it can be confused with power. To clarify, let us describe power.
Power is the time rate of energy. If you are driving at 70 miles per hour, how far have you gone? You cannot answer this question until you know a time interval. Speed is a time rate of distance. After specifying a time interval, then the distance can be determined. In one hour, 70 miles are traveled. In two hours, 140 miles are covered. Now back to energy and power. Power is energy per unit of time. Power has the English unit of Btu per hour (Btu/hr), or the Metric unit of watts. A watt is joules per second.
Power can be viewed as a capacity. A 100 watt light bulb is the capacity of that light bulb. It has 100 watts whether it is on or off. Turn it on, and then energy is consumed. A Formula One race car with 900 horsepower has more capacity to use energy than a 200 horsepower Chevy Cobalt. Power is the rate at which energy is used.
---Quote---
1 joule is equal to 0.000948451382809 Btu thermochemical.
Definition of each type of unit:
* The Joule (symbol J, also called Newton meter, Watt second or Coulomb volt) is the SI unit of energy and work. The unit is named in honor of the physicist James Prescott Joule (1818-1889).
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.
* The British thermal unit (BTU or Btu) is a non-metric unit of energy, used in the United States and, to a lesser extent, the UK (where it is generally only used for heating systems). The SI unit is the joule (J), which is used by most other countries.
According with "www.associatedcontent.com" on the August 05, 2008 article "Physics 101: What is the Difference between Energy and Power?" by Gary Transmeier:
---Quote---
Energy is defined as the ability to do work. This is a common and general description of energy. Another view, it takes energy to do anything. Energy is needed to move your car. Energy is needed to heat your home. Energy is needed to light the night. So on and so on. A value can be placed on this energy by using the English unit called Btu or the Metric unit called Joule. A gallon of gasoline has 125,000 Btu. Whether you drive a Honda Fit or a Lincoln Navigator, a gallon of gas has the same energy. When discussing consumption or use, then energy terms are used.
The joule is not used in common media. Another term, the watt-hour (w-h) or kilowatt hour (kWh) is used. A kilowatt is 1000 watts. Your home may have used 1100 kWh last month; this is energy. The reason the joule is not often used is because one joule is a small amount of energy. It takes 3.6 million joules to equal one kWh. The problem with kWh is it can be confused with power. To clarify, let us describe power.
Power is the time rate of energy. If you are driving at 70 miles per hour, how far have you gone? You cannot answer this question until you know a time interval. Speed is a time rate of distance. After specifying a time interval, then the distance can be determined. In one hour, 70 miles are traveled. In two hours, 140 miles are covered. Now back to energy and power. Power is energy per unit of time. Power has the English unit of Btu per hour (Btu/hr), or the Metric unit of watts. A watt is joules per second.
Power can be viewed as a capacity. A 100 watt light bulb is the capacity of that light bulb. It has 100 watts whether it is on or off. Turn it on, and then energy is consumed. A Formula One race car with 900 horsepower has more capacity to use energy than a 200 horsepower Chevy Cobalt. Power is the rate at which energy is used.
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