Hello
Woodward Schumacher sure 1000 Fire automatic circuit breaker 10 amp battery charger model WS 1010 input 60 cyclce 117 vac 2 amp Output 6-12 VDC 10 Amp.
Question is input voltage 117 vac and 2.amp,And output 6-12 Vdc10Amp.
How did the battery charger give more ampere output (10 amp) when the input was only (2 amp) ?
mrel

 

Power is transferred.
Power out = efficiency x Power in

 

That is one of the fascinating aspects of electronics.
The windings of the transformer are designed to drop the line input voltage to the level you need -- 12 v. and the amperage needed for the intended load, is a "fringe benefit" of reducing the voltage.

 

Because it uses Faraday's Laws of Transformers

http://www.youtube.com/watch?v=XSuP3-Krdik

http://www.youtube.com/watch?v=CEceD1bxWYU

 

Question is input voltage 117 vac and 2.amp,And output 6-12 Vdc10Amp.
How did the battery charger give more ampere output (10 amp) when the input was only (2 amp) ?
mrel

The power in is Vin * Iin = 117 * 2 = 234 watts

The power out is Vout * Iout = 12 * 10 = 120 watts

So it's only about 50% efficient given your numbers. If that's true, it must run a bit warm.