Watt Hour to Megajoule Converter

A watt-hour (Wh) is a unit of energy equal to the energy consumed by a device with a power rating of one watt operating for one hour. It equals 3,600 joules and is commonly used for measuring energy in small electronic devices.

The watt-hour developed alongside electrical technology as a convenient way to measure energy consumption in smaller electrical devices. It became particularly important with the rise of portable electronics and battery-powered devices where kilowatt-hours would be impractically large.

Watt-hours are commonly used for measuring battery capacity in portable electronics, energy consumption of small appliances, and in renewable energy systems for small-scale applications. They're standard for smartphone batteries, laptop batteries, and small solar power systems.

A megajoule (MJ) is a unit of energy equal to one million joules (10⁶ J). It represents moderate to large amounts of energy, commonly used for measuring food energy content, fuel values, and mechanical work in engineering applications.

The megajoule gained prominence with the development of energy-conscious engineering and nutrition science. It became particularly useful for expressing food energy content as an alternative to calories, and for measuring energy in automotive and mechanical engineering applications.

Megajoules are used in nutrition labeling (as an alternative to calories), automotive engineering, mechanical systems, and fuel energy content. They're found on food packaging in many countries, vehicle fuel efficiency ratings, and engineering calculations for mechanical work and heat transfer.