Wh to kJ

Watt-Hour (Wh)

⇄

Kilojoule (kJ)

Decimal places

WATT HOUR

Definition: A watt hour (Wh) is a unit of energy that represents the amount of energy consumed or produced by a device operating at one watt for one hour.

Usage: Watt hours are commonly used to measure electrical energy in various applications, including household energy consumption and battery capacities.

Definition: A kilojoule (kJ) is a unit of energy equivalent to 1,000 joules. It is used to quantify energy, work, or heat.

Usage: Kilojoules are frequently used in nutritional contexts to measure the energy content of food, as well as in various scientific and engineering applications.

The watt hour was named after James Watt, a Scottish inventor and mechanical engineer known for his work on the steam engine. The unit reflects both the power (in watts) and the duration (in hours) of energy consumption.

The kilojoule derives from the joule, which was named after the English physicist James Prescott Joule. The prefix “kilo-” indicates a factor of one thousand, thus making the kilojoule a larger unit of energy measurement.

Conversion Table:

h	kilojoule
1 watt h	3.6 kilojoule
5 watt h	18 kilojoule
10 watt h	36 kilojoule
20 watt h	72 kilojoule
50 watt h	180 kilojoule
100 watt h	360 kilojoule
PRACTICAL APPLICATIONS
EVERYDAY USE CASES
Home Energy Consumption: Many household appliances, such as refrigerators and microwaves, display their energy usage in watt hours, helping users understand their energy consumption patterns.
Battery Life: The capacity of batteries in devices like smartphones and laptops is often measured in watt hours, allowing consumers to compare battery life across different devices.
PROFESSIONAL APPLICATIONS
Electric Vehicles: In the automotive industry, the energy consumption of electric vehicles is often measured in watt hours, which is crucial for understanding range and efficiency.
Renewable Energy Systems: Solar panels and wind turbines often report their energy output in watt hours, providing insights into the performance and viability of renewable energy sources.
SCIENTIFIC RESEARCH
Energy Efficiency Studies: Researchers often use watt hours and kilojoules to analyze and compare the energy efficiency of various systems and technologies.
Nutritional Science: In studies of energy intake and expenditure, kilojoules are used to quantify the energy provided by food, which is essential for understanding metabolic processes.