Ohm's law

• Natuurkunde / Scheikunde
• Middelbare school
• vwo
• Leerjaar 2

Ohm's law

Resistance, Potential difference and current

What will be covered

• What is current? Including its unit and symbols.
• What is potential difference? including its unit and symbols.
• What is resistance? Including its unit and symbols.

• What is the relationship between current, potential difference and resistance? — Ohm's law.

You will need to know?

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

You will need to know?

• What are the two types of charges?
• What is electricity?

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

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

Positive charges

Two types of charges

Two types of charges

Positive charges

Negative charges

• Like charges repel

• Opposite charges attract

Two types of charges

Two types of charges

Positive charges

Negative charges

The symbol for charge: Q

The unit of charge: Coulomb

Symbol for Coulomb: C

Less elektrons than protons

More elektrons than protons

Two types of charges

Two types of charges

Positive charges

Negative charges

The symbol for charge: Q

The unit of charge: Coulomb

Symbol for Coulomb: C

Less elektrons than protons

More elektrons than protons

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 

Electricity is a flow of charge 

You will need to know?

• What are the two types of charges?
• What is electricity?

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

You will need to know?

• What are the two types of charges?
• What is electricity?

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

You will need to know?

• What are the two types of charges?
• What is electricity?

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

• What is current?

• What is potetial difference?

• What is resistance?

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.

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

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

What is current?

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

What is current?

The amount of coulomb per second in a flow of electric charge — 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

time — seconds

I=​t​​Q​​

The amount of coulomb per second in a flow of elctric charge — Coulomb/second

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

What is potential difference?

• Electricity is a flow of charge
• What creates this flow of charge?

What is potential difference?

• Electricity is a flow of charge
• What creates this flow of charge? 

A potential difference

What is potential difference?

• Electricity is a flow of charge
• What creates this flow of charge? 

A potential difference?

What is potential difference?

What is potential difference?

What is potential difference?

What is potential difference?

What is potential difference?

What is potential difference?

This can be

Quantified

What is potential difference?

What is potential difference?

The difference in energy each coulomb caries between two points — Joule/coulomb

What is potential difference?

• Symbol: V
• Unit: Volt (V)
• Formula:                            Potential differece = energy/ charge

Energy — Joules

Charge — Coulombs

The difference in energy each coulomb caries between two points — Joule/coulomb

V=​Q​​E​​

What is resistance?

• A flow of charge — Current (Ampere - coulomb/second)

• Cause by a potential difference  (volt – a diffrence in joule/coulomb)

• To a certain degree this flow is resisted.

What is resistance?

What is resistance?

• Symbol: R
• Unit: Ohm (Ω)

How much a flow of charge is resisted.

Ohm's law

Ohm's law

• Current (I ) — Coulomb/second
• Potential difference (V)
• Resistance(R)

Ohm's law

• Current (I ) — Coulomb/second
• Potential difference (V)
• Resistance(R)

R=​I​​V​​

Ohm's law

R=​I​​V​​

Ohm's law

R=​I​​V​​

3=​2​​6​​

Ohm's law

I=​R​​V​​

2=​3​​6​​

What have we covered?

• Current(I) measured in ampere(A) — Coulomb/second. 
• Potential difference(V) measured in volt(V) — Joule/Coulomb.
• Resistance (R) measured in Ohm (Ω).

What have we covered?

• Current(I) measured in ampere(A) — Coulomb/second. 
• Potential difference(V) measured in volt(V) — Joule/Coulomb
• Resistance (R) measured in Ohm (Ω)

• The relationship between I, V and R:                     Ohm's law

R=​I​​V​​