Science year 2.3: Electricity

• Natuur, Leven en Technologie

Today

Reviewing 2.1 and 2.2

2.3 about electricity

Lesson up

Making exercises from the book

Which types of energy do you know?

conduction is heat transfer through...

1. solid materials
2. fluids and gasses
3. nothing
4. glass

What is a conductor

1. material that prevents heat from traveling
2. material that is very hot
3. material that lets heat travel easily
4. somebody that works in a tram

What is a catalyst?

1. something that makes substances burn
2. something that prevents materials to burn
3. something that increases the ignition energy
4. something that lowers the ignition energy

Learning goals

Name different sources of electricity

02:33

What is an insulator?

1. a material that does not conduct electricity
2. a material that conducts electricity
3. a clamp to connect two electric wires
4. a electric source

What is electricity?

Electricity is caused by the flow of electrons moving through a conducting material

- Those electrons go from the power source to the device

- In the appliance they leave their energy behind

- They go back to the power source to be charged.

The plastic around the wire is an insulator (cable jacket and wire insulation)

The copper wire is a conductor (stripped wire)

phet.colorado.edu

Assignment 

Make the following circuits work in the applet

- let a lightbulb burn with a battery

- let a lightbulb burn with a battery and a switch

- let 2 lightbulbs burn with a battery and a switch

There is a electrical current when...

1. the circuit is closed
2. when there is a electric source
3. when the wires are conductors
4. all three need to be true

Current 

How many electrons flow past every second.

 

Measured in Amps (A) 

with an am-meter

Voltage 

How much electrical energy each electron is carrying. 

 

Measured in Volts (V) 

with a voltmeter

How much voltage is in an electric socket at your home?

Voltage 

The mains socket has a voltage of 230V 

This can be dangerous and even deadly

24V is the safe limit  

Transformers raise/lower voltage