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Electrical conductors

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1. A material that lets electricity pass through it is called ...

an electrical conductor

an electrical insulator

an electrical appliance

2. A material that does NOT let electricity pass through it is called ...

an electrical conductor

an electrical insulator

an electrical appliance

3. Which of the following materials is an electrical conductor?

Silver

Silver-coloured plastic

Cork

4. Which of the following materials is an electrical insulator?

Aluminium

Gold

Rubber

5. 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

6. 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 the flow of electricity in the circuit is greater

7. Ruby has connected two bulbs across two batteries in a simple circuit. How can she make the bulbs dimmer?

Replace one of the batteries with a section of wire

Replace one of the batteries with a cork

Replace one of the bulbs with a section of wire

8. Ruby makes a complete simple circuit with one bulb and three batteries. The bulb lights for an instant and then goes out. Why?

Not enough electricity flows around the circuit

Too much electricity flows through the bulb's filament

The batteries are flat

9. Why is electrical wiring usually made from copper?

Because copper is shiny

Because copper conducts electricity

Because copper is not magnetic

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

To make it look pretty

To help electricity flow along the wire

To make it safe

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