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+//===========================================================================
+//chapter 8 example 10
+
+clc;clear all;
+
+//variable declaration
+V       = 230;	//voltage in V
+I        = 10;		//current in A
+T       = 30;		//time in minutes
+x      =0.8;		//power factor 
+n     = 890;		//number of revolutions made
+M    = 1200;		//meter constant in revolutions per kWh
+E      = 58.25;		//dial reading at the end of test
+E1      = 57.35;		//dial reading at the start of test
+
+//calculations
+Ea     = (V*I*(T/(60))*x)/(1000);		//Energy consumed 1 minute
+Em   = E-E1;			//energy consumption recorded by the meter in kWh
+e        = Em-Ea;			//error in registration in kWh 
+N        = M*Em;			//actual revolutions required to be made by the  meter for an energy consumption of 0.90kWh
+e       = (n-N)/(T);			//error in rpm
+
+//result
+mprintf("error = %3.2f rpm",e);
+