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5.2 Voltage sources
5.2 Voltage sources
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Slide 1:
Tekstslide
physics
Middelbare school
havo, vwo
Leerjaar 2
In deze les zitten
18 slides
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interactieve quizzen
en
tekstslides
.
Lesduur is:
45 min
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5.2 Voltage sources
Slide 1 - 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 2 - Tekstslide
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 - Tekstslide
Connecting batteries
If you connect batteries in series (behind each other), you can add their voltages together.
Slide 4 - Tekstslide
Voltages
mains
voltage = 230 V
Safe voltages = voltages untill 24 V
You can convert the mains voltage with a
transformer
.
Slide 5 - Tekstslide
Study Skills 7 on page 309
Slide 6 - 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 7 - Tekstslide
excercises:
17 -> 20
25
Slide 8 - Tekstslide
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 9 - Quizvraag
18a. Read off
the
voltage
A
3 V
B
27 V
C
2,7 V
D
13,5 V
Slide 10 - Quizvraag
18b. Read off
the
voltage
A
18 V
B
90 V
C
9 V
D
1.8 V
Slide 11 - Quizvraag
19.
Slide 12 - Tekstslide
Slide 13 - Tekstslide
20a. What's
the voltage?
A
6 V
B
4.5 V
C
3 V
D
1.5 V
Slide 14 - Quizvraag
20b. What's
the voltage?
A
6 V
B
0 V
C
3 V
D
1.5 V
Slide 15 - Quizvraag
20c. What's
the voltage?
A
6 V
B
4.5 V
C
0 V
D
1.5 V
Slide 16 - Quizvraag
20d. What's
the voltage?
A
6 V
B
0 V
C
3 V
D
1.5 V
Slide 17 - Quizvraag
next week : small test 5.1 & 5.2
Slide 18 - Tekstslide
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