Electrical Conductors & Insulators

What is an electrical circuit?

• A collection of electrical equipment

• A path around which electrical current flows

• A series of conductors and insulators

• A light bulb and battery

Besides cells or batteries, what is another source of electrical power?

• Lightbulbs

• Motors

• Petrol

• Electricity mains

You have made a simple circuit with one bulb. If you want to add an extra bulb without the first bulb dimming, what would you need to design?

• A series circuit

• A parallel circuit

• A complex circuit

• An incomplete circuit

Why are electrical wires covered with plastic or rubber?

• Plastic and rubber are comfortable materials to touch

• Smooth materials keep wires from getting tangled

• Plastic and rubber are good electrical insulators

• Plastic and rubber can be made in different colours so people can tell different leads apart

A material which allows electrical current to pass through is called ________________.

• An insulator

• A cell

• A connection

• A conductor

Which of these materials would not be a good electrical conductor?

• Copper

• Glass

• Silver

• Iron

What will a circuit with an open switch do?

• It will not allow electricity to pass through

• It will allow electricity to pass through

• It will resist electricity

• It will make a good electrical insulator

What symbol is used in a circuit diagram to represent a bulb?

• A circle

• Two parallel lines: one short and one long

• An X inside a circle

• The letter M inside a circle

What does the symbol above represent?

• Open switch

• Wire

• Closed switch

What does the symbol above represent?

• Bell

• Wire

• Cell