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+// Example 7.5
+// Designing Power-Factor Correction
+// From figure 7.10(a)
+V_rms=500; // Volts
+f=60; // Radian Frequency (rad/s)
+omega=377; // (rad/s)
+P_1=48*10^3; // Watts
+pf_1=0.60; // Lagging
+P_2=24*10^3;// Watts
+pf_2=0.96; // Leading
+// For Load 1
+S_1= P_1/pf_1; // apparent power
+Q_1=sqrt(S_1^2-P_1^2); // Reactive power
+I_1= S_1/V_rms; // RMS current drawn by load 1
+// For Load 2
+S_2=P_2/pf_2; // apparent power
+Q_2=-sqrt(S_2^2-P_2^2); // Reactive power
+I_2= S_2/V_rms; // RMS current drawn by load 2
+P_12= P_1+P_2;
+Q_12=Q_1+Q_2;
+S_12= sqrt(P_12^2+Q_12^2);
+I_12=S_12/V_rms;
+pf_12=P_12/abs(S_12);
+// With reference to table 7.3
+P_C=0;
+Q_C=-Q_12;
+V_C=V_rms;
+C=-Q_C/(omega*abs(V_C)^2);
+disp(C,"Value of Capacitance for unity power factor(in Farad)=")