Electricity

A material that lets electricity pass through is called an electrical...

• conductor

• insulator

• appliance

• variable

A material that does not let electricty pass through is called an electrical...

• conductor

• insulator

• appliance

• variable

Which of the following are electrical conductors?

HINT: There are two correct answers.

• Silver

• Silver-coloured plastic

• Wood

• Iron

Which of the following materials is a good electrical insulator?

• Aluminium

• Gold

• Rubber

• Copper

In which circuit will the bulb or bulbs glow brightest?

• A simple circuit with one bulb and one battery

• A simple circuit with one bulb and two batteries

• A simple circuit with two bulbs and one battery

• A simple circuit with no battery

Why is a bulb brighter when it is powered by two batteries rather than one?

• Because the flow of electricity in the circuit is less

• Because the flow of electricity in the circuit is the same

• Because there is no flow of electricity

• Because the flow of electricity in the circuit is greater

You connected two bulbs and two batteries in a simple circuit. How can it be made dimmer?

• Replace one of the batteries with a section of wire

• Replace one of the batteries with a cork

• Remove the battery

• Replace one of the bulbs with a section of wire

You make a simple circuit with one bulb and three batteries. The bulb flicers and goes out. Why?

• Not enough electricity flows around the circuit

• Too much electricity flows through the bulb's filament

• The batteries are flat

• There is no switch

Why is electrical wiring usually made from copper?

HINT: There are two correct answers

• Copper is shiny

• Copper is a good electrical conductor

• Copper is less dangerous than other conductors

• Copper is cheap

Why is electrical wiring usually covered with a layer of plastic?

• To make it safer

• To make it look pretty

• To help electricity flow along the wire

• Because it is cheap