2-9 Knowing more 2.3

Electricity in gasses
and liquids (p. 83)
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 (10 min)
- Working by yourself 
     (8 min)
- Corrections (5 min)
- Time to make the test yourself (17 min)
- Conclusion (5 min)
For the next lesson, bring a photo of your consumer unit (meterkast)
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Slide 1: Slide
NatuurkundeMiddelbare schoolhavo, vwoLeerjaar 2

This lesson contains 19 slides, with interactive quizzes and text slides.

time-iconLesson duration is: 15 min

Items in this lesson

Electricity in gasses
and liquids (p. 83)
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 (10 min)
- Working by yourself 
     (8 min)
- Corrections (5 min)
- Time to make the test yourself (17 min)
- Conclusion (5 min)
For the next lesson, bring a photo of your consumer unit (meterkast)

Slide 1 - Slide

                       Lesson goals:
- Explain if gasses can conduct an electric current, and if yes, under which conditions.

- Explain if liquids can conduct an electric current, and if yes, under which conditions.

Slide 2 - Slide

Electricity in gasses
  • A high voltage in a fluorescent tube 
        causes it to flicker and then a 
        continuous current can flow.
  • Something similar happens with lightning. The high voltage between the cloud and the ground creates a channel of conducting air. 
  • The cloud discharges a current of 100 000 A.

Slide 3 - Slide

Electricity in liquids
  • If you touch the two terminals of a 
        rectangular battery to your toung, 
        you can feel a tingeling sensation. 
  • If you hold the termals of a rectangular battery up against your skin, you dont feel anything. 
  • This is because there are fluids on your toungue that contain disolved salts, and this conducts electricity.

Slide 4 - Slide

In the bathroom
  • In wet rooms such as bathrooms 
       or kitchens, you should therefore 
       be extra careful with electricity.
  • A damp skin is a better conductor than a dry skin.
  • When an electric current passes through a body, the muscles contract. This is how we controll our muscles.

Slide 5 - Slide

ECG (electrocardiograph)
An ECG records the electrical activity of the heart. 
This is shown as pulse traces on a monitor.

Slide 6 - Slide

What causes a gas to conduct an electric current?
A
High voltage
B
Electrons
C
High current

Slide 7 - Quiz

What causes a liquid to conduct an electric current?
A
density
B
colour
C
mass
D
salt

Slide 8 - Quiz

What does ECG stand for?
A
electrocardiograph
B
electrocardiogram
C
electricity-capacitygram
D
energycardiograph

Slide 9 - Quiz

What do you know about current in a series circuit?
A
It keeps on decreasing
B
It keeps on increasing
C
It stays the same

Slide 10 - Quiz

What do you know about the current in a parallel circuit?
A
It is the same everywhere
B
Current in a side branch is less than that in a main branch
C
There is no specific rule

Slide 11 - Quiz

Inside a plasma light is a vacuum.
There is absolutely nothing inside.
A
true
B
false

Slide 12 - Quiz

A fluorescent tube flickers to cause conductivity in the gas.
A
true
B
false

Slide 13 - Quiz

Electrons have a blue purple colour.
A
true
B
false

Slide 14 - Quiz

Fresh water is a better electric conductor than salt water.
A
true
B
false

Slide 15 - Quiz

A heart rate meter makes use of an electric current.
A
True
B
False

Slide 16 - Quiz

Now do  58 to 61 (p. 83)
WHEN YOU ARE DONE: Research conductivity of liquids online
timer
8:00
RULES:
  • Write in your writingbook


  • Use: Your textbook
  • No discussion

  • In 8 minutes we will discuss the answers

Slide 17 - Slide

Slide 18 - Slide

Conclusion:
  • A gas can conduct a current if the 
       voltage is high enough.
  • Liquids can also conduct a current. 
  • A liquid is especially a good conductor if there are disolved salts in the solution.

Slide 19 - Slide