§12.1 & 12.2 Potential Difference

§12.1 Batteries and Cells
&
§12.2 Potential Difference



Science - TTO2
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Slide 1: Slide
ScienceUpper Secondary (Key Stage 4)

This lesson contains 18 slides, with interactive quiz, text slides and 1 video.

time-iconLesson duration is: 45 min

Items in this lesson

§12.1 Batteries and Cells
&
§12.2 Potential Difference



Science - TTO2

Slide 1 - Slide

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 - Slide

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 - Slide

Charge and Current

  • Remember this one? --> 

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

Slide 4 - Slide

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 - Slide

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

Slide 6 - Slide

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

Slide 7 - 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 - Slide

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 fedge more energy. 

Slide 10 - Slide

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 11 - Slide

Slide 12 - Slide

Time for some practice:
  • Read p. 164-167 (TB) 
  • Do Summary Questions p. 164 + 166 (TB) 
  • Do workbook exercises p. 84 + 85 (WB) 

Slide 13 - Slide

Slide 14 - Slide

Homework evaluation
In the next slide, write down the homework exercises that you found most difficult. Next lesson we will take some time to answer a few of those quetions. 

Slide 15 - Slide

Write down the number and page of the homework exercises that you found most difficult:

Slide 16 - Open question

What is potential difference?

Slide 17 - Slide

What is potential difference?
The difference in energy per coulomb between two points

Slide 18 - Slide