# 2-9 Knowing more 2.3

Electricity in gasses
and liquids (p. 83)
What you need:
- 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)
1 / 19
Slide 1: Tekstslide
NatuurkundeMiddelbare schoolhavo, vwoLeerjaar 2

In deze les zitten 19 slides, met interactieve quizzen en tekstslides.

Lesduur is: 15 min

## Onderdelen in deze les

Electricity in gasses
and liquids (p. 83)
What you need:
- 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 -Tekstslide

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 -Tekstslide

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 -Tekstslide

Electricity in liquids
• If you touch the two terminals of a
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 -Tekstslide

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 -Tekstslide

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

#### Slide 6 -Tekstslide

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

#### Slide 7 -Quizvraag

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

#### Slide 8 -Quizvraag

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

#### Slide 9 -Quizvraag

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 -Quizvraag

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 -Quizvraag

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

#### Slide 12 -Quizvraag

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

#### Slide 13 -Quizvraag

Electrons have a blue purple colour.
A
true
B
false

#### Slide 14 -Quizvraag

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

#### Slide 15 -Quizvraag

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

#### Slide 16 -Quizvraag

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

• No discussion

• In 8 minutes we will discuss the answers

#### Slide 18 -Tekstslide

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.