2-4 Different power sources (2.2)

Different power 
sources (p. 66)
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)
- Group discussion (5 min)
- Content (12 min)
- Video dynamo (3 min)
- Working by yourself 
       (15 min)
- Discuss activities (7 min)
- Conclusion (3 min)
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Slide 1: Slide
NatuurkundeMiddelbare schoolhavo, vwoLeerjaar 2

This lesson contains 25 slides, with interactive quizzes, text slides and 1 video.

time-iconLesson duration is: 50 min

Items in this lesson

Different power 
sources (p. 66)
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)
- Group discussion (5 min)
- Content (12 min)
- Video dynamo (3 min)
- Working by yourself 
       (15 min)
- Discuss activities (7 min)
- Conclusion (3 min)

Slide 1 - Slide

                       Lesson goals:
- Explain what the voltage is on 
    our electric network. 

- The difference between direct   
   current and alternating current.

- Explain how batteries, dynamo's 
   and solar cells work.

Slide 2 - Slide

Discovery (p. 66)
Questions 1 up to 4 (not 9) discus in your group
timer
5:00

Slide 3 - Slide

Slide 4 - Slide

The correct voltage
Electricity in the socket comes from:

- Power stations
- Wind turbines
- Solar cells
These are all examples 

Slide 5 - Slide

Slide 6 - Slide

Voltage
  • Light bulb: 230 V
       Torch: 4,5 V
  • Volt = the voltage of electricity, unit V
  • A lamp made for 4,5 V burns weak on 3V and breaks at a voltage of above 4,5 V
  • A high voltage is more dangerous than a low voltage, higher than 100 V can be fatal.

Slide 7 - Slide

Alternating current and direct current
Direct current: A battery has a 
+ and a - symbol and provides DC
Alternating current: In a wall socket 
the + and - poles alternate rapidly.
Appliances made for alternaitng current dont work on direct current. 
Bicycle dynamo delivers alternating current.

Slide 8 - Slide

Batteries
  • At the + and - pole, different chemical reactions take place. 
  • Substances are converted into different substances. 
  • This is how a potential difference is 
        induced accross the poles of the 
        battery. 
  • When it is connected in a closed 
        circuit a current starts flowing. 

Slide 9 - Slide

Some things to know...
  • If the battery is empty, the substances (reactants) are finished. 
  • The 1,5 volt alkaline batteris are used most often. 
  • Rechargeable batteries have a voltage of just under 1,5 V. 
  • A batterypack or accumulator is made up of more than one rechargeable batteries or cells.

Slide 10 - Slide

Dynamo
  • It exists of an axle, coil and magnets, like an electromotor.
  • The axle turns, and the coil moves past the magnets and produces an electric current. 

  • It produces alternating current
  • Bicycle dynamo is brighter when 
  • you cycle faster - due to a greater voltage.
  • A power station has a very big dynamo 
        (generator)

Slide 11 - Slide

Slide 12 - Video

Solar cells:
  • Direct current, expensive, lasts decades.
  • You need to convert direct current to alternating current.

Slide 13 - Slide

All batteries provide a voltage of 1,5 V.
A
True
B
False

Slide 14 - Quiz

A battery is a chemical power source.
A
True
B
False

Slide 15 - Quiz

Batteries provide direct current.
A
True
B
False

Slide 16 - Quiz

Rechargeable batteries have the same voltage as non-rechargeable batteries.

A
True
B
False

Slide 17 - Quiz

There is a large dynamo in a wind turbine.
A
True
B
False

Slide 18 - Quiz

A coil and magnet is present in a dynamo.
A
True
B
False

Slide 19 - Quiz

Direct current is not dangerous.
A
True
B
False

Slide 20 - Quiz

Now do  19 up to 27 (p. 70)
WHEN YOU ARE DONE: 
timer
1:00
RULES:
  • Write in your writingbook


  • Use: Your textbook
  • No discussion

  • In 10 minutes we will discuss the answers

Slide 21 - Slide

Slide 22 - Slide

Slide 23 - Slide

Slide 24 - Slide

Conclusion
- Electricity is provided by a power 
    source.
- Electrical appliances must be connected to the right voltage. 
- With direct current the current only flows in one direction, and with alternating current the direction of the current changes consistently. 
- A battery provides direct current and a dynamo provides alternating current. 

Slide 25 - Slide