3T Electricity 1.2

• Natuurkunde
• Middelbare school
• vwo
• Leerjaar 3

Electricity

§2  Transporting electrical energy

Welcome!

Plan of today

1. Questions about homework?

2. Explenation of §2

3. Example exercise together

4. Working on the exercises of §2

Questions about homework?

2, 5, 6, 8

Learning objectives

- You can explain why the electricity grid uses a variety of voltages.

- You can explain how a transformer works and can perform calculations on the primary and secondary voltages and coils.

The electricity grid

Why do we use such a high 

voltage for transport?

How can we change the voltage

 in the transformer stations?

The effective voltage

The transformer

What is the relation 

between the voltages and

the number of turns?

Transformer Demonstration

The transformer of your phone charger
needs to turn the 230V mains voltage into a
12V alternating voltage. The secondary coil has 42 turns. How many turns does it's primary coil have?

Question from last lesson

The transformer of your phone charger needs to turn the 230V mains voltage into a 12V alternating voltage. The secondary coil has 42 turns. How many turns does it's primary coil have?

An ideal transformer is used to directly transform the
380 kV on the high-voltage line to the domestic voltage
in our outlets. The current through the outlets is 0.1A.
Calculate the current running through the high-voltage lines.

Work on exercises

Read: page 21-25

Exercises: 1, 3, 5, 7, 9

Not finished? -> Homework