**Full name:** zettawatt

**Plural form:** zettawatts

**Category type:** power

**Scale factor:** 1.0E+21

The SI derived unit for power is the watt.

1 watt is equal to 1.0E-21 zettawatt.

Valid units must be of the **power** type.

You can use this form to select from known units:

The SI prefix "zetta" represents a factor of
10^{21}, or in exponential notation, 1E21.

So 1 zettawatt = 10^{21} watts.

The definition of a watt is as follows:

The watt (symbol: W) is the SI derived unit for power. It is equivalent to one joule per second (1 J/s), or in electrical units, one volt ampere (1 V·A).

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