Inside Two Kinds of Cars: teacher key

Gas and Electric Cars, grade 4 edition, written for 4th grade. See how a gas engine burns fuel and how a gas car sends power to the wheels. Then see how an electric car uses a battery and a motor.

Read the book. Print this page for the key.

Questions and answers

1. Where does a gas car burn its fuel?
   • In the tailpipe
   • Inside the engine itself (answer)
   • In the battery
2. What lights the fuel in a gas engine?
   • The tailpipe
   • A spark plug (answer)
   • The transmission
3. What do the burning gases push?
   • The charge port
   • The tailpipe
   • The piston (answer)
4. What does an electric car use for fuel, in place of gasoline?
   • A tailpipe
   • A battery (answer)
   • A piston
5. What sets how much power goes to an electric car's motor?
   • The tailpipe
   • The controller (answer)
   • The piston

Words

• piston: moving engine part
• transmission: power passer
• battery: energy store
• controller: power manager