Lesson 4

• Nask
• Middelbare school
• havo, vwo
• Leerjaar 2

Lesson 5

Lesson 4 – charge and current

Period 4 Electricity

This lesson

• Recap quizz
  
• Charge and current
• Practice exercises

Learning goals

• You can name the two types of change and how they interact
  
• You can name the unit of charge.
  
• You're able to give a precies definition of electric current.
  
• You can name the unit of current.
  
• You're able to do calculations using electric current.
  

Recap quizz

What are the two types of electrical charges?

1. Up and down
2. Red and blue
3. Positive and negative
4. Voltage and current

Describe the interactions between positive and negative charges in your own words

Which particle causes a positive charge?

1. Protons
2. Positron
3. electrons
4. Neutrons

Which particle causes negative charge?

1. Protons
2. Positrons
3. electrons
4. Neutrons

What is the unit of charge?

1. volt
2. newtons
3. coulomb
4. ampere

What do you call a material through which electricity can flow easily?

1. A conductor
2. An Insulator

What do you call a material through which electricity cannot flow easily

1. A conductor
2. An Insulator

Exercise

a) Draw a circuit diagram for the circuit in the image below

b) Draw a circuit diagram for the circuit of a doorbel with a light that turns on when the bell is rings. 

Charge and current

Two types of charges

Two types of charges

Positive charges

Two types of charges

Positive charges

Negative charges

Two types of charges

Positive charges

Two types of charges

Negative charges

Electric Charge

• The thing with electrons is: There are SO many!

• We don't measure charge in the number of electrons, but in batches.

• On such batch is one coulomb.

One coulomb

6 241 000 000 000 000 000 electrons

What is electricity?

Electricity is a flow of charge 

Electricity is a flow of charge 

Electricity is a flow of charge 

What is current?

First, pause the video and try to answer it for yourself. After that continue playing the video.

What is current?

You already know:

• Electricity is a flow of charge.

First, pause the video and try to answer it for yourself. After that continue playing the video.

What is current?

You already know:

• Electricity is a flow of charge.

This can be

Quantified

First, pause the video and try to answer it for yourself. After that continue playing the video.

What is current?

You already know:

• Electricity is a flow of charge.

This can be

Quantified

The amount of coulomb flowing through an electric circuit per second — Coulomb/second

First, pause the video and try to answer it for yourself. After that continue playing the video.

What is current?

The amount of coulomb flowing through an electric circuit per second —  Coulomb/second

First, pause the video and try to answer it for yourself. After that continue playing the video.

What is current?

• Symbol: I
  
• Unit: Ampere (A)
• Formula:                           Current = Charge / time

Charge — Coulombs (C)

time — seconds (s)

I=​t​​Q​​

The amount of coulomb flowing through an electric circuit per second —  Coulomb/second

First, pause the video and try to answer it for yourself. After that continue playing the video.

Learning goals

• You can name the two types of change and how they interact
  
• You can name the unit of charge.
  
• You're able to give a precies definition of electric current.
  
• You can name the unit of current.
  
• You're able to do calculations using electric current.