2-2 Electromotor (2.1)

Glowing, electromotor
and speakers (p. 600)
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)
- Jigspace (8 min)
- Working on your own 
        (12 min)
- Corrections (5 min)
- Conclusion(5 min)
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Slide 1: Diapositive
NatuurkundeMiddelbare schoolhavo, vwoLeerjaar 2

Cette leçon contient 24 diapositives, avec quiz interactifs et diapositives de texte.

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Glowing, electromotor
and speakers (p. 600)
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)
- Jigspace (8 min)
- Working on your own 
        (12 min)
- Corrections (5 min)
- Conclusion(5 min)

Slide 1 - Diapositive

                       Lesson goals:
    -  Explain how the colour changes when an object heats up. 

- Explain how an electromagnet works. 

- Explain how an electromotor works.

- Explain how a loudspeaker works.

Slide 2 - Diapositive

Glowing
  • At 2 500 degrees a light bulb 
        gives off white light.
  • Charcoal (in a barbeque) glows read because it is not that hot.
  • The coulours emitted as an object heats up: 
       red -> orange -> yellow -> white -> bluish

Slide 3 - Diapositive

Electromotor (1)
  • In an electromotor there are rolls of copper wire  (coil).
  • A coil through wich a current flows
        becomes a magnet.
  • When the current stops flowing, the 
        magnetic properties disappear.
  • With electromagnets heavy metal plates can be moved. 

Slide 4 - Diapositive

Electromagnet
There are two ways in which we can make an electromagnet stronger: 
- More turns of copper wire.
- Greater current.

Slide 5 - Diapositive

Electromotor (2)
The two northpoles of a magnet 
repel each other.

A north and a south pole of a 
magnet will attract each other.

Slide 6 - Diapositive

Electromotor (3)
  • The most important components
       of an electromotor are the coil
       and a magnet. 
  • Throu the coil there is a rotatble axle. 
  • Due to the forces of attraction and repulsion
       of the magnet, the coil start turning.

Slide 7 - Diapositive

Loudspeaker
  • A loudspeaker converts current into sound. 
  • It also contains a coil and a magnet. 
  • The electricity flows through the coil, an thus it is attracted or repelled by the magnet. 
  • Because the magnet starts to move 
the paper cone in the loudspeaker also  
moves and creates sound.

Slide 8 - Diapositive

An electromagnet consists of a cool through with an electric current flows.
A
True
B
False

Slide 9 - Quiz

In your house you can find up to 10 items working with an electromagnet.
A
True
B
False

Slide 10 - Quiz

The earphones of you iPod works with a small coil.
A
True
B
False

Slide 11 - Quiz

With the colour of a light bulb, you can estimate the temperature.
A
True
B
False

Slide 12 - Quiz

When you change the direction of the current in a coil, the north- and south pole of the magnet switch sides.
A
True
B
False

Slide 13 - Quiz

Jigspace - speaker
timer
8:00

Slide 14 - Diapositive

Now do all teh questions from 
6 up to 13 (blz. 61)
WHEN YOU ARE DONE: search youtube videos on how electromotors work
timer
12:00
RULES:
  • Write in your writingbook


  • Use: Your textbook
  • No discussion

  • In 12 minutes we will discuss the answers

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Slide 23 - Diapositive

Conclusion:
- When an electric current flows through a coil 
   then the coil becomes an electromagnet.
the more the number of turns of copper wire = stronger magnet
- If a coil (with a current passing through it) is in a magnetic field, forces are excerted on the coil and the magnet.
- This is the principle that makes an electromotor turn.

Slide 24 - Diapositive