# §12.1 & 12.2 Potential Difference

§12.1 Batteries and Cells
&
§12.2 Potential Difference

Science - TTO2
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Slide 1: Tekstslide
ScienceLower Secondary (Key Stage 3)

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

## Onderdelen in deze les

§12.1 Batteries and Cells
&
§12.2 Potential Difference

Science - TTO2

#### Slide 1 -Tekstslide

Learning Objects §12.1
• Recognise the significance of the value of the ‘emf’ of a battery.
• Recall electromotive force (emf) is measured in volts.
• Describe how to use a voltmeter to measure the emf of a battery or a potential difference in a circuit.
• Explain the significance in terms of energy of the emf of a battery.

#### Slide 2 -Tekstslide

Learning Objects §12.2
• Explain what is meant by potential difference.
• State that potential difference (pd) is measured in volts.
• Describe how to use a voltmeter to measure the pd across a component in a circuit.
• Explain the significance in terms of energy of the emf of a battery and a pd in a circuit.

#### Slide 3 -Tekstslide

Charge and Current

• Remember this one? -->

• The Coulomb, in other words, a bag of electrons!

#### Slide 4 -Tekstslide

Charge and Current
In the previous LessonUp you learned that if charge (electrons) starts to move, we call it an Electric Current.
You can measure the current with an Ammeter and the unit is Ampere.

I = Q / t
[A] = [C] / [s]

#### Slide 5 -Tekstslide

Voltage / Potential Difference
In this LessonUp you will learn WHY charge moves and what it does.

#### Slide 6 -Tekstslide

Time for a video!
Watch the video about Potential Difference on the next slide.

#### Slide 8 -Video

Energy
If you want the light bulb to shine, it needs to be supplied with Energy.

You can think of the coulombs (bags of electrons) as the carriers of Energy.

#### Slide 9 -Tekstslide

The coulombs get energy from the battery and carry it to the light bulb. They give it to the light bulb and go back to the battery to fetch more energy.

#### Slide 10 -Tekstslide

Voltage
• Energy is measured in Joules
• The number of Joules that each coulomb gives to a component such as the light bulb is known as 'Volts'
• 1 V = 1 J/C
• Another word for Voltage is Potential Difference.
Because we talk about the difference in Energy
before and after the Coulombs gave it to a component in the circuit.

#### Slide 12 -Tekstslide

Time for some practice: