initial commit / add all books

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diff --git a/3417/CH12/EX12.6.1/Ex12_6_1.sce b/3417/CH12/EX12.6.1/Ex12_6_1.sce
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+//Ex12.6.1.;calculate open circuit voltage and maximum power output

+B=2;//flux density;unit=Wb/m^2

+u=10^3;//average gas velocity;unit=m/second

+d=0.50;//distance between plates;unit=m

+E0=B*u*d;//Open ccircuit voltage

+printf(" Open ccircuit voltage E0=%f Volts",E0);

+//Generator resistance; Rg=d/sigma*A

+sigma=10;//Gaseous conductivity;unit=Mho/m

+A=0.25;//Plate Area;unit=m^2 

+Rg=d/(sigma*A);

+printf("\n Generator resistance Rg=%f Ohm",Rg);

+//Maximum power

+Maximum_power=(E0^2)/(4*Rg);

+printf("\n Maximum_power=%f watts",Maximum_power);