Energy

Energy is used up when any physical system does work. The metric system uses Calories (cal) Joules (J) or Kilojoules (kJ). These are also measurements of heat. The Imperial systems uses British Thermal Units (Btu).

Energy Unit Definitions

• 1 cal is the amount of heat required to raise the temperature of 1 gram of water at 15°C by 1°C.
• 1 Btu is the amount of heat required to raise the temperature of 1 lb of water 1°F.