Lesson 6

• Physics
• Middelbare school
• vwo
• Leerjaar 3

Lesson 6

TTO 3 — Physics

Chapter 1

Section 2 + Start section 3

Transformer

Lesson 6

TTO 3 — Physics

Chapter 1

Section 2 + Start section 3

Transformer

This lesson

• Rearranging the formula
• Ideal transformer
• Practice exercises

Voltage & number of coils

​U​s​​​​U​p​​​​=​N​s​​​​N​p​​​​

Up :voltage primary coil

Us : Voltage secondary coil

Np : Number of turns primary coil

Ns: Number of turns secondary coil

Ideal transformer

P​p​​=P​s​​

P=​t​​E​​

P=U⋅I

Two formulas to calculate power

P​p​​=P​s​​

U​p​​⋅I​p​​=U​s​​⋅I​s​​

Practice exercise

1) A primary coil on a transformer has a voltage of 240V and 500 turns.  What is the voltage over the secondary coil if the secondary coil has 25 turns?

2) 3. A secondary transformer has a current of 25A and a voltage of 5V. On the primary transformer the current is 15A. Find the primary voltage.

Section 3 — Electricity in the home

Fusebox

What type of circuit is used for in group in a fusebox?

Power

P=U⋅I

Ptot=P1+P2+P3+...

P​t​​=U⋅(I​1​​+I​2​​+I​3​​+...)

Homework

Read: section 3 and 4

Do: 

• Section 3, Exercise 1, 2 and 3
  
• Section 4, Exercise 1 and 2
  

Next lesson: Practical!