Energy Test #2 - Heat Transfer

How many ways can thermal energy be transferred?

3 main ways

What are the names of the ways thermal energy can be transferred?

conduction

What is the transfer of thermal energy with the movement of a liquid or gas?

convection

What is the transfer of thermal energy from one substance to another through direct contact?

conduction

What is the transfer of thermal energy by electromagnetic waves?

radiation

What are three examples of electromagnetic waves?

visible light

What is the name for substances that conduct thermal energy very well?

thermal conductors

Name four types of conductor substances.

metals

Name four types of insulator substances.

fiberglass

What happens to the thermal energy of two objects that are at different temperatures (when they come in contact)?

thermal energy transfers from the hotter object to the cooler object until they reach thermal equilibrium

What is the role of fiberglass insulation in homes?

to improve a home's energy efficiency and comfort by creating a thermal barrier

Air is warmer near the ceiling in a house due to what process?

convection

Write an example of radiation.

a coffee cup steaming

Write an example of conduction.

a metal spoon handle getting hot after being placed in a cup of hot coffee

Write an example of convection.

boiling water

A campfire warms the campers sitting around it by conduction.

False

Energy can travel only through matter.

False

Most of the energy on Earth comes from the sun.

True

The electromagnetic spectrum is a range of only wavelengths of visible light.

False

Heat is transferred from the colder object to the warmer object.

False

Warmer molecules have more energy than cooler ones.

True

Conduction happens mainly in the upper atmosphere of outer space.

False

Warm air always rises to the surface in a convection current.

False

The sun's energy travels through space by

electromagnetic radiation

The main way that heat moves through the atmosphere is by

convection

Hot coffee is stirred with a spoon

the spoon gets hot due to

A chair is placed several feet from a fire in a fireplace. The fireplace has a glass screen. The side of the chair facing the fireplace gets warm because of

radiation

A lava lamp contains different colored liquids inside. The liquid rises to the top because of

convection

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

convection

A space heater is placed in the corner of a bedroom.

conduction

Kitchen cookware pans have a layer of copper on the bottom to help it heat evenly.

conduction

In a swimming pool the warmer water rises to the surface.

convection

Warm air over the beach rises while cooler dense air from the ocean sinks.

convection

A huge rock at the state park gets so hot during the day that you can't sit down. The rock got hot from

radiation. You sit & get burned from

A fireman feels a door and it is hot from the fire on the other side.

conduction

You are at the top of a bunk bed and you want to turn the cool air on while your friend is on the bottom bunk.

convection

Substances that do not conduct thermal energy very well are called

insulators

If particles of two substances have the same kinetic energy

then the substances will have equal

When air is unevenly heated by the sun it causes

convection current. This motion is called

Cold air is

more dense than warm air

Energy can travel through space by

Radiation

Complete the chart:

Name of Resource

Renewable or Nonrenewable

Biomass

renewable

Natural Gas

nonrenewable

Geothermal

renewable

Solar

renewable

Hydropower

renewable

Coal

nonrenewable

Wind

renewable

What are disadvantages of using renewable energy sources?

high upfront costs

What are the advantages of using renewable energy sources?

reduced greenhouse gas emissions and improved air quality

What are disadvantages of using nonrenewable energy sources?

environmental pollution

What are the advantages of using nonrenewable energy sources?

high energy density

Energy can travel through space by

Radiation