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+//Percentage error calculation in a wattmeter
+
+clc;
+clear;
+
+//Rated Parameters
+I=50;
+V=230;
+
+R=61;// No. of revolutions
+t=37/3600; // Time in hours
+
+C=520; // Normal Disc Speed
+
+Pfl=I*V;// Power at full load
+
+Ps=Pfl*t/1000; // Power Supplied in kWhr
+
+Pr=R/C; //Power recorded in kWhr
+
+err=(Ps-Pr)*100/Ps;
+
+printf('The Percentage Error = %g percent slow \n',err)