Filling Up and Plugging In: teacher key

Gas and Electric Cars, grade 7 edition, written for 7th grade. Follow gasoline from the tank to the engine, and see the strokes inside it. Then see how an electric car is charged and driven.

Read the book. Print this page for the key.

Questions and answers

1. How is gasoline made?
   • By charging a battery
   • By breaking crude oil into products by fractional distillation (answer)
   • By turning a crank
2. What moves fuel from the tank to the fuel injection system?
   • The charge port
   • The motor shaft
   • The fuel pump (answer)
3. What happens in the compression stroke?
   • The wheels turn
   • The battery charges
   • The piston squeezes the fuel-air mixture into a smaller space (answer)
4. What does an electric motor change into motion?
   • Electrical energy (answer)
   • Crude oil
   • Engine oil
5. As of November 2026, how long can fully recharging an electric car's battery pack take?
   • 3 to 12 hours (answer)
   • 150 to 400 hours
   • 1 to 2 minutes
6. Why does an electric car need to be plugged in?
   • Its rechargeable battery stores the energy it runs on (answer)
   • Its tailpipe needs to be filled
   • Its fuel pump is empty

Words

• cylinder: engine chamber
• crankshaft: spinning engine part
• transmission: power passer
• battery: energy store