Kilowatt Hour to Millijoule Converter

A kilowatt-hour (kWh) is a unit of energy equal to the energy consumed by a device with a power rating of one kilowatt operating for one hour. It equals 3.6 megajoules and is the standard unit for measuring electrical energy consumption.

The kilowatt-hour was developed with the commercialization of electricity in the late 19th century. It provided a practical way for electric utilities to measure and bill for electrical energy consumption, becoming the standard unit for electrical energy trading worldwide.

Kilowatt-hours are universally used for measuring and billing electrical energy consumption in homes, businesses, and industries. They're found on every electricity bill, used in energy efficiency ratings for appliances, and are standard in renewable energy system specifications and grid energy trading.

A millijoule (mJ) is a unit of energy equal to one thousandth of a joule (10⁻³ J). It represents small amounts of energy, typically found in electronic circuits, small mechanical systems, and precision energy measurements.

The millijoule became important with the development of precision electronics and small-scale energy measurements. It was particularly useful for measuring energy in electronic pulses, small mechanical impacts, and low-energy physical and chemical processes.

Millijoules are used in electronics for measuring pulse energy, in precision mechanics for small impact measurements, in laser technology for pulse energy, and in materials testing for small-scale energy absorption measurements.