4. Units of Energy The metric units are known as the Systeme International, usually abbreviated Sl, becoming standard throughout the world The Joule: the metric unit of energy. One newton acting through one meter is equivalent to the expenditure of one joule The British Thermal Unit(Btu): One Btu is defined to be the amount of heat energy required to raise the temperature of one pound of water by one degree Fahrenheit. 1 Btu= 1055 joules The Calorie: One calorie is the amount of energy required to raise the temperature of one gram water by one degree Celsius 1 calorie =4. 184 joule, 1 food Calorie(Calorie)=1000 calorie(kcal) The Foot-Pound: A force of one pound acting through a distance of one foot by definition expends one foot-pound energy, and one foot-pound of work is done 1 Btu=778 ft- Ib The Electron-Volt: Moving one electron through and electronic potential difference of one volt 1 Joule 6X108eV4. Units of Energy The metric units are known as the Systeme’ International, usually abbreviated SI, becoming standard throughout the world. The Joule: the metric unit of energy. One newton acting through one meter is equivalent to the expenditure of one joule. The British Thermal Unit (Btu): One Btu is defined to be the amount of heat energy required to raise the temperature of one pound of water by one degree Fahrenheit. 1 Btu = 1055 joules The Calorie: One calorie is the amount of energy required to raise the temperature of one gram water by one degree Celsius. 1 calorie = 4.184 joule, 1 food Calorie (Calorie) = 1000 calorie (kcal) The Foot-Pound: A force of one pound acting through a distance of one foot by definition expends one foot-pound energy, and one foot-pound of work is done. 1 Btu = 778 ft∙lb The Electron-Volt: Moving one electron through and electronic potential difference of one volt. 1 Joule = 6X108 eV