Physical Science 16.3

Fill in the Blank

One family uses an electric water heater. What is their cost per year for machine A?

Fill in the Blank

One family uses an electric water heater. What is their cost per year for machine D?

Multiple Choice

The price of machine A is $300 more than the price of machine D. If the family uses a machine for 10 years, which one costs less overall? (Hint: Add the price to the operating cost for 10 years.)

• A

• D

Multiple Choice

Another family uses a gas water heater. Which machine should this family choose?

• A

• B

• C

• D

Multiple Choice

Only about one-third of the energy in gasoline is converted to work in an internal combustion engine.  The rest of the chemical energy is

• lost as unused mechanical energy

• destroyed by the engine

• converted to potential energy

• discharged as waste heat

Multiple Choice

How is a room heated by an electric baseboard heating system?

• conduction and convection only

• conduction and radiation only

• convection and radiation only

• conduction, convection, and radiation

Multiple Choice

Forced air heating systems are often used to heat many buildings from a central location

• true

• false