To make an electromagnet, a conductor should be coiled around —

• a glass tube
• an iron nail
• a roll of paper
• a wooden stick

Early scientists most likely saw a discharge of electricity for the first time when observing a —

• waterfall
• rainbow
• lightning storm
• volcano erupting

Which energy transformation most likely occurs in a steam iron?

• Electrical energy changes to heat energy.
• Electrical energy changes to sound energy
• Mechanical energy changes to heat energy.
• Mechanical energy changes to light energy

In this picture, the iron filings show the shape of the magnetic —

• axis
• core
• field
• pole

A fifth-grade class constructed this circuit. Which of these objects most likely made the light glow when connected to points X and Y?

• Plastic straw
• Cotton string
• Aluminum foil
• Rubber eraser

Which item is designed to change electrical energy into heat energy?

• alarm clock
• hand dryer
• fan
• telephone

Bits of paper are attracted to the surface of this balloon. What attracts the paper pieces to the balloon?

• Friction
• Magnetism
• Potential energy
• Static electricity

Which of these correctly shows what happens when two magnets are placed side by side?

• F
• G
• H
• J

The electrician in this picture is wearing rubber gloves for protection. The purpose of the rubber gloves is to —

• keep the electrician dry
• create an electrical circuit
• produce electricity
• insulate the electrician

An electric motor is designed to turn electrical energy into — 

• solar energy
• potential energy
• static electricity
• mechanical energy