Pistons and Plugs: teacher key

Gas and Electric Cars, grade 2 edition, written for 2nd grade. Follow the power in a gas car, from the spark to the wheels. Then see what an electric car does instead.

Read the book. Print this page for the key.

Questions and answers

1. What lights the fuel in a gas engine?
   • A spark plug (answer)
   • A tailpipe
   • A battery
2. What do the burning gases push?
   • The charge port
   • The piston (answer)
   • The tailpipe
3. What passes a gas engine's power on to the wheels?
   • The transmission (answer)
   • The battery
   • The spark
4. Which part does an electric car have instead of a gas engine?
   • A motor (answer)
   • A tailpipe
   • A piston
5. What does a car do when it is plugged in?
   • It burns fuel
   • It charges (answer)
   • It lights the fuel

Words

• piston: moving engine part
• transmission: power passer
• battery: energy store
• motor: energy changer