Understanding Electric Circuits and Charges

What powers the doorbell at Ms. Frizzle's house?

• A lizard hitting the bell

• A battery

• A secret button

• A green arrow

How did Ms. Frizzle separate the electric charges on her hair and the balloon?

• By heating them up

• By rubbing the balloon on her hair

• By putting them in water

• By using a magnet

What happens when red and blue electric charges join back together?

• They disappear

• They make a spark

• They turn green

• They get cold

What is an electric current?

• A river of water

• Moving electrical charges

• A type of light

• A hot wire

What part of a light bulb gets hot and glows when electricity flows through it?

• The glass bulb

• The battery

• The filament

• The wire outside the bulb

What happens if the path of an electrical circuit is broken?

• The charges move faster.

• The light bulb gets brighter.

• The electrical charges stop moving.

• The battery gets hotter.

What happens when a battery in a circuit stops working?

• The charges move faster

• The charges stop moving

• The circuit gets hotter

• The circuit becomes stronger

Which of these is a safe way to use electricity?

• Touching bare wires

• Playing with electrical cords

• Using a flashlight powered by batteries

• Mixing electricity and water