Heat Flow

• What is heating?

  Heating is the process of transferring thermal energy from one object to another.
• How does thermal energy transfer occur between two objects?


  Thermal energy is transferred from the hotter object to the colder object when they are in contact.
• What causes heat flow to occur between two systems?


  Heat flow occurs due to a difference in temperature between the two systems.
• What happens to thermal energy during heat flow?


  Thermal energy is transferred until the temperatures of the two systems are the same.
• Do you need to explain how heat flow occurs for your exam?


  No, you only need to describe or identify situations where heat flow occurs.
• How does heat flow cause objects to cool down?


  A warm object will gradually lose energy to its surroundings due to heat flow.
• Give an example of heat flow causing cooling.


  A hot drink cools as heat is lost to the colder surroundings.
• How does heat flow affect a house's temperature?


  Heat flow causes a house to cool down when heat is lost to colder surroundings.
• Why do houses stay warm in summer?

  Houses stay warm in summer because the surroundings are also warm, reducing heat flow.
• How do heating devices work?


  Heating devices work by increasing their thermal energy to transfer to objects they contact.
• What energy sources do heating devices use to increase thermal energy?


  Heating devices use energy from fuels or an electrical supply.
• How does a radiator heat a room?


  A radiator heats a room using hot water pumped through it, causing heat flow to the air.
• How does a kettle heat water?


  A kettle heats water using a heating device that raises the temperature, allowing heat flow into the water.
• What are the key concepts of heat flow and thermal energy transfer?


  • Heating transfers thermal energy from one object to another.
  • Heat flows from hotter to colder objects in contact.
  • Heat flow occurs due to temperature differences.
  • Objects cool down as they lose energy to surroundings.
  • Heating devices increase thermal energy using fuels or electricity.
• What factors affect the cooling of a house?

  • Heat flow to colder surroundings causes cooling.
  • Houses stay warm in summer due to warm surroundings.
  • Cold days lead to increased heat loss from houses.