Energy transfers

What is the definition of CONDUCTION?

• When heat is transferred from objects like rays of light or electromagnetically.

• a  hot liquid or air that  expands, becomes less dense, and rises or becomes more dense, and sinks.

• When heat transfers from objects that are touching.

• When heat transfers through the heater or AC in your house.

What is the definition of CONVECTION

• When heat transfers through waves.

• When heat transfers from objects that are touching.

• material that expands, becomes less dense, and rises or becomes more dense, and sinks due to changes in temperature

• Heat traveling from the sun

Which of the following is an example of convection?

• A hair dryer is drying up your hair.

• When the AC or heater changes the temperature.

• When a car engine turns hot after being turned on.

• When you are making soup and the water is rising and lowering.

The baby chickens are kept warm from the heat lamps demonstrates this type of heat transfer. 

• conduction

• convection

• radiation

Walking on the warm sand sand with your bare feet demonstrates this type of heat transfer. 

• conduction

• convection

• radiation

A group of friends gather around a fire to stay warm.

• conduction

• convection

• radiation

Near the ceiling of a room the air is warmer. The warm air rises because of

• conduction

• convection

• radiation

In heat transfer, heat always flows from the _______________ substance to the _______________ substance.

• Hotter to colder

• Colder to hotter

• Hotter to hotter

• Colder to colder

The handle of a metal spoon warms up when it is placed in a hot bowl of soup because of

• Convection

• Conduction

• Radiation

• insulation.

When you use a microwave, what is the main way that heat is transferred?

• Convection

• Conduction

• Radiation

• insulation.