Paul, Yes, a watt second is the same thing as a joule. I suppose the manufacturer felt that people are more familiar with watts and seconds than with joules.
Good hearing from you again! Jim "Fardig, Paul S." wrote: > > I have two different photographic flash units. One is rated in joules and > one in "watt-seconds," which is commonly used for flash units. Looking at > the mathematics, I see a joule is defined as a kg*m2/s2, while a watt is a > kg*m2/s3. Therefore, a watt-second would be the same as a joule, since the > seconds to the minus 3 power would become seconds to the minus 2 power when > multiplied by seconds (overall > energy times time equals power). > > Is my reasoning correct?? Any ideas why the industry would be using > "watt-seconds" instead of joules? > > Paul -- Metric Methods(SM) "Don't be late to metricate!" James R. Frysinger, CAMS http://www.metricmethods.com/ 10 Captiva Row e-mail: [EMAIL PROTECTED] Charleston, SC 29407 phone/FAX: 843.225.6789
