5.2 Voltage sources

5.2 Voltage sources
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5.2 Voltage sources

Slide 1 - Diapositive

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 2 - Diapositive

Fig. 14
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 3 - Diapositive

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

Slide 4 - Diapositive

Voltages
mains voltage = 230 V

Safe voltages = voltages untill 24 V

You can convert the mains voltage with a transformer.

Slide 5 - Diapositive

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 6 - Diapositive

Slide 7 - Vidéo

17 Why do dynamos not state the voltage they deliver?
A
They were built in Russia
B
It depends on the light attached to it
C
It depends on the type of bike
D
It depends on the movement of the dynamo

Slide 8 - Quiz

18a. Read off
the
voltage
A
3 V
B
27 V
C
2,7 V
D
13,5 V

Slide 9 - Quiz

18b. Read off
the
voltage
A
18 V
B
90 V
C
9 V
D
1.8 V

Slide 10 - Quiz

19.

Slide 11 - Diapositive

Slide 12 - Diapositive

20a. What's
the voltage?
A
6 V
B
4.5 V
C
3 V
D
1.5 V

Slide 13 - Quiz

20b. What's
the voltage?
A
6 V
B
0 V
C
3 V
D
1.5 V

Slide 14 - Quiz

20c. What's
the voltage?
A
3 V
B
4.5 V
C
0 V
D
1.5 V

Slide 15 - Quiz

20d. What's
the voltage?
A
6 V
B
0 V
C
3 V
D
1.5 V

Slide 16 - Quiz

Experiment 1
https://phet.colorado.edu/sims/html/circuit-construction-kit-dc/latest/circuit-construction-kit-dc_en.html
Write down your answers and send a photo of your answers!

Slide 17 - Question ouverte