How many horsepower hour in 1 zettajoule?
The answer is 3.7250614122937E+14.
We assume you are converting between horsepower hour and zettajoule.
You can view more details on each measurement unit: horsepower hour or
zettajoule
The SI derived unit for energy is the joule.
1 joule is equal to 3.7250614122937E-7 horsepower hour, or 1.0E-21 zettajoule.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between horsepower hours and zettajoules.
Type in your own numbers in the form to convert the units!

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

So 1 zettajoule = 10^{21} joules.

The definition of a joule is as follows:

The joule (symbol J, also called newton meter, watt second, or coulomb volt) is the SI unit of energy and work. The unit is pronounced to rhyme with "tool", and is named in honor of the physicist James Prescott Joule (1818-1889).

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