# §11.4 Charge and Current

§11.4 Charge and Current
Science - TTO2
1 / 15
Slide 1: Tekstslide
ScienceUpper Secondary (Key Stage 4)

In deze les zitten 15 slides, met interactieve quizzen, tekstslides en 1 video.

Lesduur is: 45 min

## Onderdelen in deze les

§11.4 Charge and Current
Science - TTO2

#### Slide 1 -Tekstslide

Learning Objects
• State that an electric current is due to a flow of charge.
• Recall that electric current is measured in Amperes (A).
• Describe the use of an ammeter.
• State that charge is measured in coulombs.
• Describe that a current is a rate of flow of charge.
• Do calculations with the formula: I = Q / t.

#### Slide 2 -Tekstslide

Time for a video!
Watch the video about Charge and Current on the next slide.

#### Slide 4 -Video

Electric Charge
• An electric current is due to a flow of charge
• Looking at the model of an atom: Electrons are the only charged particles that are able to move.
• Therefore: An electric current is a flow of electrons.

#### Slide 5 -Tekstslide

Electric Charge
• The thing with electrons is: There are SO many!
• That is why we don't measure charge in the number of electrons, but in Coulombs.
• Think of it as a BIG bag of electrons      -->

#### Slide 6 -Tekstslide

Electric Current
When electric charge starts moving, we call it an electric current.
Therefore:

"An electric current is due to a flow of electric charge"

#### Slide 7 -Tekstslide

Electric Current
• To measure the current we use an Ammeter.
• It simply 'counts' how many Coulombs pass by a point in the circuit every second.
• The unit of Electric Current is called Ampere (A).

#### Slide 8 -Tekstslide

Electric Current
The ammeter has to measure the amount of charge that flows through the lightbulb.

Therefore, it has to be in the same circuit as the lightbulb and the battery.

We say the components are in series, because the same amount of charge flows by each component every second.

#### Slide 9 -Tekstslide

Electric Current
Now that we know that Electric Charge is measured in Coulombs, and Electric Current is the amount of Coulombs passing through a point per second... It's time to put this in a formula:

We know that:
1 Ampere = 1 Coulomb per second
Therefore: I = Q / t

See the next slide for the eqation.

#### Slide 11 -Tekstslide

Time for some practice:
• Do Summary Questions p. 161 (TB)
• Do workbook exercises p. 82 (WB)

#### Slide 12 -Tekstslide

When water starts flowing, we call it a current. An Electric Current is also a flow of something...

What flows in an Electric Current?
A
Drops of electricity
B
Electrons
C
Amperes
D
Protons

#### Slide 13 -Quizvraag

What is the unit of Electric Charge?
A
Charge (Q)
B
Ampere (A)
C
Coulombs (Q)
D
Coulombs (C)

#### Slide 14 -Quizvraag

Where do we use an Ammeter for?
A
To measure the amount of charge flowing through a point every second
B
To measure how hot a light bulb gets
C
It supplies energy for the light bulb to shine