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Electrical Conductors and Insulators
A pair of scissors could be used to complete an electrical circuit.

Electrical Conductors and Insulators

In this KS2 Science quiz we take a closer look at two things which are vital if we want to control electricity - electrical conductors and insulators.

Electrical conductors and insulators control heat. There’s nothing like a power cut to make you grateful for electricity! Ordinarily, people take it for granted but we haven’t always had power in our homes. The brilliant Serbian inventor and electrical engineer, Nicola Tesla, invented the generating system which sends electricity to our homes. He also created a method to harness electrical energy and send it anywhere on Earth, although he died before it was completed.

In order to harness electricity, you need to know all about electrical conductors and insulators. Do you know why electrical plugs are made from plastic or why insulators are important in an electrical circuit? Check your knowledge with this science quiz.

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1.
The filament in a light bulb glows because of the material's resistance. What does this mean?
The filament does not allow the flow of electricity
The filament speeds up the flow of electricity
The filament slows down the flow of electricity
The filament gets annoyed with the electricity
Resistivity is a measure of how well materials conduct electricity - less resistance means greater conductivity
2.
Which of these is not an electrical conductor?
Gold
Copper
Aluminium
Rubber
Rubber is an excellent electrical insulator
3.
A material which is an electrical insulator does what?
It does not allow electricity to pass through it easily
It does not allow heat to travel through it easily
It allows heat to travel through it easily
It allows electricity to pass through it easily
Insulators are used to prevent electricity from passing through
4.
In a complete electrical circuit, which materials does electricity flow through?
Electrical insulators
Electrical conductors
Only leads or wires
Only batteries
Every component (part) of a complete electrical circuit must include a material which conducts electricity
5.
Which of these is not an electrical insulator?
Wood
Plastic
Silver
Glass
Silver, like other metals, is not a good electrical insulator. In fact, silver is the best electrical conductor. Because of its expense, it is not used as often as copper
6.
Which of these could be used to complete an electrical circuit?
A piece of gravel
A rubber
A crayon
A pair of scissors
Scissors are made of metal and all metals can conduct electricity
7.
Why are electrical plugs made of plastic?
Plastic is stronger than all other materials
Plastic is a good electrical conductor
Plastic protects people from electricity
Only plastic can be made into the right shape for a plug
Plastic is an electrical insulator. If plugs weren't made of plastic (or another insulator), it would be impossible to touch the plug without receiving an extremely dangerous electric shock
8.
Which of these is a good electrical conductor?
Water
Sweat
The human body
All of the above
Electricity passes easily though anything wet, such as sweaty hands, and also through the human body. This is why it is so important to NEVER touch a live lead and to always be careful when using electrical objects. Never touch anything electric when you have damp hands
9.
Why are insulators important in an electrical circuit?
They make the circuit safe to touch
Electricity will only flow through insulators
Light bulbs and buzzers are only made of insulating materials
All of the above
Insulating materials protect us (and other living organisms) from electrical currents and they also protect the circuit from damage or interference
10.
A material which is an electrical conductor does what?
It does not allow electricity to pass through it easily
It does not allow heat to travel through it easily
It allows heat to travel through it easily
It allows electricity to pass through it easily
Conductors are used to transfer electricity from one place to another, for example in a circuit

 

Author:  Sheri Smith

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