Wattsekunden

Wattsekunde is a unit of energy in the International System of Units (SI). It is equivalent to one joule. The watt-second is defined as the energy dissipated or converted by one watt of power acting over one second. Mathematically, it is represented by the product of power in watts and time in seconds: 1 Ws = 1 W * 1 s. Since 1 watt is equal to 1 joule per second (1 W = 1 J/s), substituting this into the equation gives 1 Ws = (1 J/s) * 1 s = 1 J. Therefore, watt-second is a direct synonym for joule.

The unit is often used in contexts where energy is related to electrical power over a specific duration, such as in capacitors, flash units for cameras, or in some energy billing scenarios, though joule is more commonly used as the standard SI unit for energy. Its usage highlights the relationship between power and energy. For instance, a device consuming 100 watts for 5 seconds would have consumed 500 watt-seconds, or 500 joules, of energy. While not a primary SI base unit, its definition is directly derived from the base units of the SI system.