Electricity & Magnetism

Which of these materials is a good conductor of electricity?

• Rubber

• Glass

• Metal

• Newspaper

Electric lights will not come on unless their electrical circuit is a —

• parallel circuit

• series circuit

• closed circuit

• short circuit

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 of these substances conducts electricity the best?

• wood

• brick

• copper

• plastic

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

What material would be safest to use as an insulator to cover electrical wires?

• aluminum

• tin

• rubber

• water

Copper wire is often wrapped in plastic. Plastic material is a good —

• electromagnet

• insulator

• circuit

• current

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

• waterfall

• rainbow

• lightning storm

• volcano erupting

Benjamin Franklin discovered the form of energy produced by lightning. Experiments with lightning killed many people before he discovered that lightning is a form of —

• gravity

• water

• magnetism

• electricity

A comb is rubbed with a piece of wool fabric and placed next to some scraps of paper. The paper moves toward the comb. The movement of the paper is caused by —

• chemical energy

• magnetic attraction

• mechanical energy

• static electricity