Electricity 3rd grade

What is one way that electrical energy is used in everyday life?

• To make sound with a drum
• To operate a computer
• To lift a box from the floor
• To cause sunlight to shine through a window

Which of the following is an example of energy being used to move or lift objects.

• riding a bike down the street
• carrying a book across the room
• running to catch a bus
• all the answer choices

A cat stands at the edge of a table.  It is about to jump to the floor.  At this moment, what kind of energy does the cat have?

• sound energy
• mechanical energy
• kinetic energy
• potential energy

Which of the following describes an electromagnet?

• A magnet created when electric current flows through wire coiled around a iron bar.
• A magnet created when wire is wrapped around an iron bar.
• A magnet that is attracted to anything with an electric current
• none

Which of the following groups of materials make the best insulators?

• gold, wood, copper
• copper, plastic, gold
• rubber, glass, plastic
• graphite, glass, wood

What purpose does a light bulb serve in a electric circuit?

• It is a resistor
• It is the switch
• It is an insulator
• It is the power source

Why is it important to make sure that electric cords are covered in plastic?

• plastic is a good insulator
• plastic is a good conductor
• plastic is a good insulator and good conductor
• plastic is a poor insulator and poor conductor

A material is classified as a conductor if it can do which of these things?

• Let electric charges flow through it
• Stop electric charges from flowing through it
• provide the energy for an electric circuit
• change electric energy into mechanical energy

An electric circuit is made from a D-cell battery, two wires, and a light bulb.  What flows through the wires?

• Chemicals from inside the battery
• chemicals from inside the light bulb
• electrons
• iron atoms

A switch is connected into an electric circuit.  How is the electric current affected when the switch is turned off?

• The circuit becomes broken and the current flows at a slower rate.
• The circuit becomes broken and the current stops flowing.
• The current continues to flow in the same way.
• none of the choices