Energy

Which of these best completes the circuit?

• rubber band

• metal nail

• leather shoelace

• wooden toothpick

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

A class prepared some electric circuits using battery, connecting wires, and three light bulbs. Which of these circuits can make the three bulbs light?

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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

Many electrical wires are wrapped with a plastic coating because plastic is —

• less expensive than steel

• more dense than copper

• able to keep its shape

• a good insulator