6-6 Working with resistances in parallel (6.3)

• Natuurkunde
• Middelbare school
• havo
• Leerjaar 3

Resistance in parallel (p 232)

Stationary

- Writing book

- Pen and pencil

- Calculator

- iPad

Mark

- NO

Lessonup

- YES

School bags in

the cupboard

Phones in the phone bag

Lesson goals:

• Calculate the resistance in a parallel circuit
• Explain how the current works in a parallel circuit
• Explain how the voltage works in a parallel circuit
• Use the law of ohm to calculate unknown values in a parallel circuit

More resistances in parallel...

​R​tot​​​​1​​=​R​1​​​​1​​+​R​2​​​​1​​+​R​3​​​​1​​+...

The more resistors you connect in parallel, the smaller the total resistance.

What is the total resistance?

1. 3,3
2. 5
3. 10
4. 15

What is the total resistance?

1. 1,2
2. 2,4
3. 1,4
4. 5

What is the total resistance?

1. 1
2. 3
3. 3,3
4. 9

Current in a parallel circuit 

The current divides 

into the branches of 

the parallel circuit

THEREFORE

I​tot​​=I​1​​+I​2​​+I​3​​+...

What is the current in I1?

1. 1,2
2. 1,9
3. 5
4. 81

Wat is the current in I2?

1. 1,7
2. 3,3
3. 5

The voltage in a parallel circuit

Each circuit component has the same voltage as the power source.

26 (p 238)

30 (p 238)

31 (p 238)

What did you
learn today?

Homework

TEST YOURSELF (paragraph 6.3)