Energy Unit Converter (J - kWh)
Convert between Joules (J) and Kilowatt-hours (kWh)
How to convert between Joules (J) and Kilowatt-hours (kWh)
1 Joule (J) is equal to 2.778 x 10^-7 kilowatt-hours (kWh). To convert from J to kWh, divide the Joules value by 3,600,000, and to convert from kWh to J, multiply the kWh value by 3,600,000.
Unfamiliar with a term? Check the electric motor glossary.
| Joules (J) | Kilowatt-hours (kWh) |
|---|---|
| 1000000 | 0.2778 |
| 2000000 | 0.5556 |
| 3000000 | 0.8334 |
| 4000000 | 1.1112 |
| 5000000 | 1.3890 |
| 6000000 | 1.6668 |
| 7000000 | 1.9446 |
| 8000000 | 2.2224 |
| 9000000 | 2.5002 |
| 10000000 | 2.7780 |
Energy Conversion Chart
The Story Behind Measuring Energy in Joules vs. Kilowatt-hours
The measurement of energy in Joules and Kilowatt-hours involves different units and is rooted in historical and practical considerations. Let's explore the background of each unit and their relevance within the scope of electric motors:
- Origin: The Joule is named after James Prescott Joule, an English physicist who made significant contributions to the study of thermodynamics. The unit was officially named in the late 19th century as a recognition of Joule's work on the relationship between heat, energy, and mechanical work. The Joule is a derived unit of energy in the International System of Units (SI). It is defined as one newton meter, representing the energy transferred to an object when a one-newton force is applied over one meter.
- Symbol: J
- Usage: Joules are commonly used in scientific and engineering contexts to quantify energy in various systems, including electric motors. In the context of electric motors, Joules can be used to express the energy consumed or produced during specific operations or events such like calculating energy losses.
- Origin: The Kilowatt-hour is a unit of energy derived from the watt-hour, which is named after James Watt, an 18th-century Scottish inventor and engineer. The kilowatt-hour became a practical unit for measuring electrical energy as electric power systems developed. The Kilowatt-hour is equal to one kilowatt (1 kW) of power expended for one hour. It is commonly used in the context of electrical power generation, distribution, and consumption.
- Symbol: kWh
- Usage: Kilowatt-hours are widely used in the electric power industry and by utility companies to measure and bill for electrical energy consumption. In the context of electric motors, Kilowatt-hours are often used to quantify the total energy consumed by a motor over a specific period. This is particularly relevant for assessing the efficiency and operational costs of electric motors.
In summary, Joules and Kilowatt-hours are both relevant units in the study and operation of electric motors. Joules are often used in technical analyses and specific engineering calculations, while Kilowatt-hours are the standard unit for measuring electrical energy consumption. Motors are often rated in terms of power (kW) and their energy consumption is measured in Kilowatt-hours over a specific period, making them particularly important for assessing the operational cost of electric motors.