# 4.2 Voltage sources

5.2 Voltage sources
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Slide 1: Tekstslide
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In deze les zitten 10 slides, met tekstslides.

Lesduur is: 45 min

## Onderdelen in deze les

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

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 3 -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 4 -Tekstslide

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

So a AA battery:

U = 1.5 V

#### Slide 5 -Tekstslide

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

#### Slide 6 -Tekstslide

Voltages
mains voltage = 230 V

Safe voltages = voltages untill 24 V

You can convert the mains voltage with a transformer.

#### Slide 7 -Tekstslide

Study Skills 7 on page 309

#### Slide 8 -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 9 -Tekstslide

Hw
Read 4.2 Repeat chapter 3 (check the previous Lesson Ups and/or your notes)
Do. 1 till 7