Electricity | Grade 6 | Unit 1 - Concept 3 - Lesson 3 - Part (2/2) | Science

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In This Lesson:
▌In the electric circuit, there must be a source of electricity:
Most electric circuits consist of many components that conduct electricity, which are:
-A metal wire.
-An electric power sources.
-A switch.
-An electric device.
The switch:
A switch is the most common tool to open and close the electric circuit.
A switch can be manual such as a wall switch for lights, where :
When the switch is closed (turned on), it closes the circuit (closed electric circuit), so the electric current flows through the circuit.
When the switch is opened (turned off), it opens the circuit (opened electric circuit), so the electric current doesn't flow through the circuit.
Electric conductors and insulators:
• Electric conductors also known as "good conductors of electricity".
• Examples of good conductors of electricity:
All metals such as copper and aluminum.
Electric insulators also known as "bad conductors of electricity".
• Examples of bad conductors of electricity:
Rubber.
Plastic.
Current safety:
• Most electric wires are coated with rubber or plastic which are bad conductors of electricity, to protect people from electric shock.
• Touching non insulated wire that an electric current flows through causes an electric shock and may cause death, because the human body contains a lot of water which is good conductor of electricity.
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