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+//Finding heat efficiency
+//Example 2.20(pg. 57)
+clc
+clear
+m=1//mass in kg
+S=4200//specific heat of water
+T2=100,T1=15// temp in degree C
+H=m*S*(T2-T1)//heat utilised in J
+printf('Heat utilised is %6.2f Joules \n',H)
+W=500//wattage rating of kettle in volts
+t=15*60// time in sec
+Hd=W*t//heat developed in J
+printf('Heat developed is %6.2f Joules \n',Hd)
+He=(H/Hd)*100//Heat efficiency
+printf('Thus heat efficiency is %3.2f percent',He)