1.1.2 Examples of Energy Transfer

• Boiling Water in a Kettle

  Electrical energy → Thermal energy
• A Roller Coaster Ride

  Gravitational potential energy → Kinetic energy → Thermal and Sound energy
• Photosynthesis in Plants

  Light energy → Chemical energy
• A Moving Car

  Chemical energy → Kinetic energy → Thermal and Sound energy
• A Light Bulb

  Electrical energy → Light energy → Thermal energy
• A Pendulum Swing

  Gravitational potential energy ↔ Kinetic energy
• Burning a Candle

  Chemical energy → Thermal energy + Light energy
• A Bouncing Ball

  Gravitational potential energy → Kinetic energy → Elastic potential energy → Thermal energy + Sound energy
• A Battery-Powered Torch

  Chemical energy → Electrical energy → Light energy + Thermal energy
• Cooking Food

  Electrical energy (or chemical energy in gas) → Thermal energy → Chemical energy (in cooked food)
• These examples illustrate how energy can be transferred between different forms and stores
• These examples highlight the principle of conservation of energy