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+//Example 19.7//
+
+f1=24.31;//g //atomic mass of magnesium
+e=0.6023*10^24;//atoms //Avogardo's Number
+q=0.16*10^-18;// C/electron  //1 coulomb of charge
+a=2;//kg //Kilogram //sacrificial anode of magnesium
+b=3;// months //period
+c=1000;//g //gram
+d=1;//kg //kilogram
+f=2;//electrons/atom
+h=1;//month //period
+a1=31;//d //days //period
+a3=1;//d //days //period
+b1=24;//h //hours //time
+b2=1;//h //hours //time
+c1=3600;//s //seconds //time
+d1=1;//A //ampere //current
+e1=1;// C/s //coloumb per second
+current=(a/b)*(c/d)*(e/f1)*f*q*(h/a1)*(a3/b1)*(b2/c1)*(d1/e1)
+mprintf("current %f A ",current)