4.2 Voltage sources

4.2 Voltage sources
Recap
Voltage
Batteries
Connecting batteries together
Safe and unsafe voltages
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Slide 1: Tekstslide
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In deze les zitten 21 slides, met interactieve quizzen, tekstslides en 2 videos.

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4.2 Voltage sources
Recap
Voltage
Batteries
Connecting batteries together
Safe and unsafe voltages

Slide 1 - Tekstslide

Slide 2 - Video

Which of the following is a good conductor of electricity?
A
Copper
B
Wood
C
Rubber
D
Glass

Slide 3 - Quizvraag

Which material is an insulator?
A
Brass
B
Aluminum
C
Iron
D
Plastic

Slide 4 - Quizvraag

Slide 5 - Link

Slide 6 - Video

What is voltage?
Voltage is the force that pushes charges (electrones) to move around a circuit. 
In other words, it is the amount of energy given to the components in a circuit from the electrons passing through the wire. 

Slide 7 - Tekstslide

Voltage source
A battery always states what voltages it supplies.

A battery supplies electrical energy. 
The current tells you how many charged particles flow past every second.
The voltage tells you how much electrical energy each particle is carrying.

Slide 8 - Tekstslide

Measuring
Voltage is measured in volts using voltmeter (V)
Current is measured in ampère using a ammeter (A)

Slide 9 - Tekstslide

Voltage sources
Today's topics: 
Solar cell
dynamo
Cell
Battery

Slide 10 - Tekstslide

A special V-source
A capacitor stores electrical energy
When you let the charge out, the voltage gets reduced, until it is empty again.

A capacitor is often used to protect components against rapid voltage changes.

Slide 11 - Tekstslide

I and V
You can compare the transport of electrical energy to the transport of petrol.
Current = trucks
Voltage = petrol

Or a central heating
current = water, voltage = heath

Slide 12 - Tekstslide

Voltage
Voltage (U) is measured in Volts (V).

So a AA battery:

U = 1.5 V

Slide 13 - Tekstslide

Connecting batteries
If you connect batteries in series (behind each other), you can add their voltages together.

Slide 14 - Tekstslide

Voltages
mains voltage = 230 V

Safe voltages = voltages untill 24 V

You can convert the mains voltage with a transformer.

Slide 15 - Tekstslide

Study Skills 7 on page 309

Slide 16 - Tekstslide

Chemical voltage sources
Batteries are chemical voltage sources because the voltage is generated by chemical reactions.

In rechargeable batteries you can make this reaction go in the opposite direction (recharge the battery). 

Batteries are small-scale chemical waste.

Slide 17 - Tekstslide

Concluding:
Recap
Voltage
Batteries
Connecting batteries together
Safe and unsafe voltages

Slide 18 - Tekstslide

Thanks and now you may: 
Read 4.2 (if necessary)
Do assignments: 4 to 7
Hw: 4.2: 1 to 7
Good luck!
If you have any questions, please ask. 

Slide 19 - Tekstslide

Electrical circuit
The link on the next page allows you to simulate an electrical circuit in a digital way. 
Create an electrical circuit consisting of:
- 2 bulbs
- 1 battery of 1,5V

Slide 20 - Tekstslide

Slide 21 - Link