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Electrical Circuits

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Silver is a good electrical conductor.

Electrical Circuits

Electricity powers our modern world. In KS2 Science, pupils learn how circuits, switches, and components make devices work safely and effectively at home and in school.

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Fascinating Fact:

When you rub a balloon on your hair, the tiny charges that build up can actually light a very small bulb – that’s electricity at work!

In KS2 Science, electrical circuits show how current flows through wires, bulbs, and switches. Understanding these basics helps pupils see how everyday appliances function.

  • Current: The flow of electric charge through a circuit.
  • Conductor: A material, like metal, that lets electricity pass easily.
  • Switch: A device used to open or close a circuit to control electricity.
What is an electrical circuit in KS2 Science?

An electrical circuit is a complete loop made of wires and components like bulbs or buzzers that allows electricity to flow and make things work.

Why are switches important in circuits?

Switches are important because they control the flow of electricity. They let you turn devices on or off safely without disconnecting the wires.

What materials conduct electricity?

Materials like copper, aluminum, and iron are good conductors. Rubber, plastic, and wood are insulators, meaning they block the flow of electricity.

1 .
A material which allows electrical current to pass through it is called what?
An insulator
A cell
A connection
A conductor
Metals make good conductors
2 .
You have made a simple circuit with one bulb. If you wanted 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
Unlike a series circuit, the lamps stay bright if you add more in a parallel circuit
3 .
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
Covering electrical wires in insulating materials such as rubber and plastic makes the leads safe to touch - an exposed wire is extremely dangerous and should NEVER be touched
4 .
Why might a circuit fail to work?
It might have a dead battery
It might have two leads connected to the positive pole of the battery and none connected to the negative
It might have a break in the circuit
All of the above
Dead batteries, incorrectly wired leads and breaks in the circuit are just some of the reasons why a circuit might not work
5 .
Besides cells, or batteries, what is another source of electrical power?
Lightbulbs
Motors
Petrol
Electricity mains
Mains electricity is the most common power source used in homes
6 .
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
Electrical current flows in one direction from the negative pole of a battery around a complete circuit to the positive pole of the battery
7 .
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
If the switch is open then there is a break in the circuit. By closing the switch the circuit is made complete
8 .
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
The letter M inside a circle represents a motor
9 .
With which group of items could you not build a complete circuit?
Crocodile leads, bulbs, switch, buzzer
Bulbs, crocodile leads, cell
Cell, switch, buzzer, crocodile leads
Wires, bulb, cell
Cells, or batteries, are the source of energy in a circuit
10 .
Which of these materials would not be a good electrical conductor?
Copper
Glass
Silver
Iron
Most metals are excellent electrical conductors. Some metals, such as aluminium, do not conduct electricity as well as other metals
You can find more about this topic by visiting BBC Bitesize - Electrical components

Author:  Sheri Smith (PhD English Literature, English Teacher & Quiz Writer)

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