Definitions
from The Century Dictionary and Cyclopedia
 n. The work done in one second of time by the expenditure of one watt of power; one sixtieth of a wattminute.
Etymologies
Sorry, no etymologies found.
Examples

The efficiency of the reflector in the WL gives a little more light output per wattsecond.

Here is the control end of a WL Ultra 600, which is a 300 wattsecond WS monobloc.

Also,what could I do with a power pack that is at a constant wattsecond?

The SI unit of energy is the joule (J), equal to one wattsecond.

Since a wattsecond is a very small energy unit and in most cases the operating times of electrical equipment amounts to many hours, the kWh

In fact, since Virginia Dominion Power charges 7.227 cents per kilowatthour, 1.12 millionths of a wattsecond would cost you 2.2 trillionths of a cent.

A joule is a wattsecond, so this capacitor could deliver one watt for 0.4165 seconds, or 0.4165 watts for one second, or any other combination in which watts times seconds equals 0.4165.

One joule equals one wattsecond, so a watthour equals 1 x 60 x 60 = 3,600 joules.

What we need to optimize for is work done per dollar and work done per joule (a wattsecond).

It has a builtin 40 wattsecond flash with diffused panel on the front and an old 5inch B&W TV on the bottom with a live feed from the camera so you can compose the picture.
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