amps to watts
How do you calculate amps to watts?

Volts x amps = watts @ 100% efficiency.
You would need the length of the wire, the gauge of the wire and the coefficient of the appliance you are powering to get real accuracy. The formula above is good for a ball park figure. 100 watt light bulb 120 volts = .833 amps, in a perfect world. 
Why?
Quote:
To early for christmas lights.......;) 
Thanks guys, I am figureing out how big of a inverter to get and noticed some appliances have amps and no watts. Thanks again.

Here is an Ohms Law chart for colculating volts and currents. http://www.hoistman.com/HoistMan/Ohms/IMAG000.JPG If you know 2 factors in your cicuit you can use this
chart to find the additional information you need. Example = You want to add 3 light fixtures to your shop, each with 1 100 watt bulb and you know you have a 115 volt service. You would devide 300 (P) by 115 (E) to find (I) which would be 2.06. So now you know that your new circuit needs to be capable of handling 2.06 amps. 
Easy now.. yeah no christmas light yet buddy!

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