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4.2 Voltage sources
4.2 Voltage sources
Recap
Voltage
Batteries
Connecting batteries together
Safe and unsafe voltages
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physics
Middelbare school
havo, vwo
Leerjaar 2
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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
quizizz.com
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
phet.colorado.edu
Slide 21 - Link
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