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+//chapter18
+//example18.7
+//page406
+
+Vcc=50 // V
+Np=5
+Ns=1
+R=50 // ohm
+R_ac=(Np/Ns)^2*R
+Po=Vcc^2/R_ac
+
+printf("ac load = %.3f ohm \n",R_ac)
+printf("maximum load power = %.3f W \n",Po)