Energy is expressed in different units in different measurement systems. Terms such as joule, calorie, kilowatt-hour or electronvolt meet different requirements in different disciplines. This tool allows you to easily and quickly convert these units.
What is the unit of energy and why is it named differently in different systems?
Energy is the ability to do a job. Different disciplines (electrical, mechanical, thermal) use different units of energy. For instance, Joule is commonly used in the SI system, while calories and BTU are more often used in thermal energy calculations.
What does the Joule unit mean?
1 Joule is the work that 1 Newton force does to an object over a distance of 1 meter. In electrical terms, 1 Volt is the energy consumed when 1 Coulomb of load is transmitted with a potential difference.
How many Joules is 1 kilowatt-hour (kWh)?
1 kWh is 3.6 million Joules (3,600,000 J). kWh is often used in household energy consumption measurements.
How is the conversion between joules and calories made?
1 calorie ≈ 4.184 Joules. This conversion is often used, especially in food energy and heat calculations.
How to do Joule - BTU conversion?
1 BTU (British Thermal Unit) is approximately 1055 Joules. It is a common unit in heating, ventilation and air conditioning systems.
How does electrical energy compare with mechanical energy?
Both are forms of energy and can be converted to each other. For instance, electric motors convert electrical energy into mechanical energy. Both forms can be expressed in Joules.
Why should efficiency be taken into account in energy conversions?
No conversion is 100% efficient. As the energy passes from one form to another, some of it exits the system with losses such as heat, sound, or vibration.
How many Joules is 1 watt-second?
1 watt-second is exactly 1 Joule. These two units refer to the same physical size.
What is the relationship between Erg and Joule?
1 Joule = 10⁷ erg. Erg is used in the CGS unit system, while the Joule is used in the SI system.
Which units express “power” and not “energy”?
A watt is a unit of power, not energy, that is, it indicates the amount of energy produced or consumed per unit time. It is calculated with this correlation: Energy = Power × Time.
