8th grade - Ch6, L3 - Energy and Thermodynamics review

Which of the following is an example of converting other forms of energy into thermal energy?

• Burning wood to heat air

• Using a fan to cool a room

• Charging a battery

• Turning on a light bulb

What is the primary function of a thermostat?

• To convert thermal energy into light energy

• To regulate the temperature of a system

• To generate electricity

• To store thermal energy

Which of the following appliances is NOT considered a heating appliance?

• Curling iron

• Coffeemaker

• Refrigerator

• Clothes iron

What does a refrigerator use to transfer thermal energy?

• Electric energy

• Solar energy

• Wind energy

• Nuclear energy

What is a bimetallic coil in a thermostat made of?

• Two types of metal bonded together

• Plastic and metal

• Wood and metal

• Glass and metal

What is the primary function of a heat engine?

• To convert mechanical energy into thermal energy

• To convert thermal energy into mechanical energy

• To convert electrical energy into thermal energy

• To convert chemical energy into electrical energy

Which of the following is an example of a vehicle that uses a heat engine?

• Bicycle

• Skateboard

• Car

• Electric scooter

What percentage of chemical energy do most automobile engines convert into mechanical energy?

• 10%

• 20%

• 50%

• 80%

What happens to the remaining gasoline chemical energy in a heat engine if only 20% is converted to mechanical energy?

• It is fully converted into mechanical energy

• It is stored for later use

• It is lost to the environment

• It is converted into electrical energy