Lesson 9 — independent and dependent variables — 2F

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

Period 3

Magnetism

This lesson

Recap 7.3

7.4 Identifying and controlling variables

Working independently

Learning goals

• Explain the relationship between electricity and magnetism
  
• Describe how to make an electro magnet
  
• Describe the difference between an independent and dependent variable

What have we learned about 

Electromagnetism

Current

Current

The flow of electricity

Electromagnetism

• The flow of electricity creates a magnetic field
  

Electromagnetism

• Changing a magnetic field creates a flow of electricity

Electromagnetism

• The flow of electricity creates a magnetic field
  

• Changing a magnetic field creates a flow of electricity

Faradays law

• The flow of electricity creates a magnetic field
  

• Changing a magnetic field creates a flow of electricity

Link

The screwdriver rule

What you have to know

• Current — the flow of electricity
  

• Faradays law — current creates a magnetic field, changing a magnetic field creates current
  

• The screwdriver rules
  

An electromagnet

Making an electro magnet

• Solenoid
  
• Core
  

Solenoid

Electro magnet schematic

what you have to know

• An electromagnet creates magnetism using faradays law
  

• How to make an electromagnet (solenoid + core + power source)
  

• The strength of an electromagnet depends on the current in the solenoid
  

Independent & dependent variables

step 1 — Working independently for 5 minutes

•  Read 7.4
• Write down your own explanation of dependent and independent variables

step 2 — Working together

•  Compare your answers to your neighbours

Independent variables

• This variables is controlled

•  This variable you make changes to

• Cause
  

• Controlled
  

Dependent variables 

• This variable is measured

• This variable reacts to the changes you make

• Effect
  

• Reacts
  

Working independently

Homework

7.4 Yellow block exercises

7.4 — workbook exercises 

Next lesson

Homework check

Learning goals

• Explain the relationship between electricity and magnetism
  
• Describe how to make an electro magnet
  
• Describe the difference between an independent and dependent variable