2-7 What is electricity (2.3)

• Natuurkunde
• Middelbare school
• havo, vwo
• Leerjaar 2

What is electricity 

(p. 77)

What you need:

- Textbook, writingbook, iPad

- Pen, pencil, geotriangle

- Calculator

Schoolbags in the cuboard

Phones in the phonebag

Bluetooth 

- ON

- VPN off

    Lesson today:

- Lesson goals (5 min)

- Content (15 min)

- Working by yourself

    (20 min)

- Corrections (8 min)

-  Conclusion (2 min)

                       Lesson goals:

- Explain what electricity is.

- Draw simple circuit diagrams.

An electric circuit

• Electricity only flows in a closed
  

        circuit.

• An electric circuit at least has:
  

       - A power source,

       - an electrical appliance,

       - connecting wires (copper)

Switch off: If the currecnt is interupted somewhere.

Current

• Current: the ammount of electricity
  

        that flows in a circuit.

• The current is the same size 
  

        everywhere in a series connection.

you could say that a client pays a powerstation for 'pumping enegry'. Technically they dont make elektricity.

The circuit diagram

To draw a circuit diagram we use symbols for the various components. Each component has its own symbol.

Circuit diagram

• The symbols are connected  
  

        with straight lines.

• These straight lines are made 
  

        with a geotriangle.

• Circuit diagrams are drawn 
  

        with a pencil.

Circuit diagram of a torch

What is actually flowing?

Electrons

• These are electrically charged particles
  
• they are very small
  

When there is lightning and with 

a plasma light, you can see the 

electrons.

Representation of the flow of an electric current.

Now do  42-48 (p79) 

WHEN YOU ARE DONE: Play with the simulation on the next page

RULES:

• Write in your writingbook
  



• Use: Your textbook
• No discussion
  


• In 20 minutes we will discuss the answers
  

https:

Conclusion

• Electricity is the flow of electrons.
  
• For the flow of electricity we need 
  

        a power source and a closed circuit. 

• You draw an electric circuit with a circuit diagram.
  
• A conductor allows an electric curent to pass through and an insulator prevents the flow of current.