2-2 Transporting electrical energy (2.1)

Transporting electrical

energy (p. 54)

Stationary

- Writingbook, iPad

- Pen, pencil geotriangle

- Calculator

Schoolbags in

the cupboard

Phones in the phone bag

Bluetooth

- ON

- VPN off

1 / 25

Slide 1: Slide

NatuurkundeMiddelbare schoolhavoLeerjaar 3

This lesson contains 25 slides, with interactive quizzes and text slides.

Lesson duration is: 50 min

Items in this lesson

Transporting electrical

energy (p. 54)

Stationary

- Writingbook, iPad

- Pen, pencil geotriangle

- Calculator

Schoolbags in

the cupboard

Phones in the phone bag

Bluetooth

- ON

- VPN off

Slide 1 - Slide

Lesson goals:

Expain what voltage is needed at different points in the electrical grid.

Explain how a transformer works.
Calcualte the voltage or the number of windings

in a coil of a transformer.

Slide 2 - Slide

Electrical grid:

If a current moves through a conductor, it becomes warm.

Energy loss: less energy is left for the user

To minimize the energyloss the current must be transported at the highest possible voltage (less heat).

Slide 3 - Slide

Powerstation

Transformer

380kV

10kV

230 V

Slide 4 - Slide

Types of current

The electrical grid does not use direct current (like batteries do) but alternating current (with goes to and fro 50 times per second, the frequency is 50 Hz)

Slide 5 - Slide

Why do we increase the current when electricity is transported over long distances?

For safety

To minimise energy loss

To establish a frequency of 50 Hz

Because this is the voltage devices need

Slide 6 - Quiz

What is the voltage in our houses?

20 kV

380 kV

10 kV

230 V

Slide 7 - Quiz

The working of a transformer

Slide 8 - Slide

How are the coils connected?

Magnetic

Electric

Slide 9 - Quiz

Formula

\frac{​ U ^{​ p^{​ ​ ​} ​ ​} ​ ​}{​ U ^{​ s ​ ​} ​} = \frac{​ N ^{​ p ​ ​} ​ ​}{​ N ^{​ s ​ ​} ​}

= voltge primary coil (V)

= Voltage secondary coil (V)

= number of windings

in the primary coil

= number of windings

in the secondary coil

U^{​ p ​ ​}

U^{​ s ​ ​}

N^{​ p ​ ​}

N^{​ s ​ ​}

Slide 10 - Slide

Slide 11 - Slide

Slide 12 - Slide

Slide 13 - Slide

Slide 14 - Slide

Slide 15 - Slide

Slide 16 - Slide

Slide 17 - Slide

Slide 18 - Slide

Slide 19 - Slide

MAAK DE VOLGENDE OPGAVE

1 t/m 4 (blz 59) en 6, 8 (blz 60)

ALS JE KLAAR BENT:

timer

15:00

REGELS:

Schrijven in je schrift

Hulp: je boek
Geen overleg (wel muziekje)

Over 15 minuten bespreken we de opgaven

Voor extra oefening maak ook opgaven 9

Slide 20 - Slide

Slide 21 - Slide

Slide 22 - Slide

Slide 23 - Slide

Lesafsluiting

Elektrische energie wordt opgewekt:

Brander, turbine, generator, condensor

Elektrische energie wordt vervoert naar onze huizen:

380 kV, 10 kV, 230 V

Werking van een transformator

\frac{​ U ^{​ p^{​ ​ ​} ​ ​} ​ ​}{​ U ^{​ s ​ ​} ​} = \frac{​ N ^{​ p ​ ​} ​ ​}{​ N ^{​ s ​ ​} ​}

Slide 24 - Slide

Hoeveel van de inhoud van de les van vandaag begrijp je?

niks

beetje

de meeste

alles

Slide 25 - Quiz