2. Date 2:Voltage & Current Lesson Outcomes How I did Targets
Task 1: Explain patterns in voltage and current in series and parallel circuits.
Level 5
Task 2: Use a model to explain voltage and current.
Level 6
Task 3: Use this model to explain differences between energy saving and conventional light bulbs.
Level 7
Connector: (Level 4)
Describe how a torch works.
Draw a complete circuits using symbols.

3. TEACHER’S NOTES
First ask the class which electrical symbols match each word, then click on the words to reveal the answers. 3

4. BIG picture What skills will you be developing this lesson?
Numeracy
Literacy
Team work
Self management
Creative thinking
Independent enquiry
Participation
Reflection
How is this lesson relevant to every day life? (WRL/CIT)

5. Electron flow
Electricity in wires is a flow of electrons along the wire.
What do we call this flow of electrons?
Electrical current

6. Cell pushes electrons around the circuit and gives them energy
Energy converted into light and heat
I am a negatively charged particle
Electrons have a lot of energy
Electrons have little energy

7. What factors affect the flow of current?
Boardworks GCSE Additional Science: Physics
Resistance and Resistors
What factors affect the flow of current?
Teacher notes
This illustration contains several discussion points relating to resistance and resistors including:
electrons (represented by blue circular characters): the electrons are completing a circuit.
George Ohm (represented by man in tracksuit): this scientist completed the early research on resistance.
treacle pit and pegged down sheet: these obstacles in the circuit represent components that resist the flow of electrons and reduce the current.
trampoline: this provides the electrons with more energy and allows them to reach a higher level.
slide: this represents a component in which electrons lose energy as they go down it.
Resistance and Voltage 7

8. Match the definition to the meaning
in your book
Current is
Voltage is
Resistance is
The restriction to the flow of electrons
The flow of electrons
Is the energy or the push given to the electrons
Apply your knowledge of above keywords, to explain a similar situation around you. (use a model)

9. New Information for Task 1
Draw a series and a parallel circuit.
Parallel circuit
Series circuit

10. Current in a series circuit
If the current here is 2 amps…
The current here will be…
The current here will be…
And the current here will be…
In other words, the current in a series circuit is THE SAME at any point
25/04/2019

11. Voltage in a series circuit
If the voltage across the battery is 6V… V 2V
…and these bulbs are all identical… V V
…what will the voltage across each bulb be?
25/04/2019

12. Voltage in a series circuit
If the voltage across the battery is 6V… V 4V V
…what will the voltage across two bulbs be?
25/04/2019

13. Changing the current
If a battery is added the current will ________ because there is a greater _____ of the electrons
If a bulb is added the current will _______ because there is greater ________ in the circuit
25/04/2019

14. Experiment Task 1 (Level 5)
Connect a series circuit with 2 bulbs and an ammeter and record the current.
Connect a series circuit with 2 bulbs and an Voltmeter and record the Voltage.
Connect a parallel circuit with 2 bulbs and an ammeter and record the current.
Connect a series circuit with 2 bulbs and an voltmeter and record the Voltage.

15. How can I improve on task 1?
Task 1: Review
Go back to your lesson outcome grid and fill out the ‘How I did’ and the ‘Targets’ column.
Lesson Outcomes
How I did
Targets
Task 1: Use a model to explain voltage and current.
Level 5
Met?
Partly met?
Not met?
How can I improve on task 1?

16. Use the picture to explain Voltage and Current (Task 2)
Keywords for Task 2:
Voltage
energy
circuit
cell
more
Apply your knowledge to explain the relationship between Voltage and current using a model.

17. How can I improve on task 2?
Task 2: Review
Go back to your lesson outcome grid and fill out the ‘How I did’ and the ‘Targets’ column.
Lesson Outcomes
How I did
Targets
Task 2: Use a model to explain voltage and current.
Level 6
Met?
Partly met?
Not met?
How can I improve on task 2?

18. How bulbs work? Task 3
A conventional light bulb has piece of resistive wire inside a glass bulb. When an electric current is applied to the wire, it gets hot and begins to glow. As the temperature of the wire increases the brighter the light gets. A typical light bulb will emit 2.5% of its energy as visible light, and wastes 97.5% of its energy mostly as heat.

19. Energy saving bulb
In Energy saving bulb, the tube is filled with small amount of mercury vapour. At each end of the tube is small heating element that is used to warm the mercury into a vapour. Since mercury is metal it is electrically conductive.
When electric current flows through this vapour the atoms get excited and give off ultraviolet light. When the ultraviolet light is absorbed by the fluorite coating, this causes it to fluorescence. This fluorite coating now is giving off visible light.

20. Task 3 (level 7)
Suggest how people can make their homes energy efficient. How will your suggestions help people to save energy and save money?

21. How can I improve on task 3?
Task 3: Review
Go back to your lesson outcome grid and fill out the ‘How I did’ and the ‘Targets’ column.
Lesson Outcomes
How I did
Targets
Task 3: Use this model to explain differences between energy saving and conventional light bulbs.
Level 7
Met?
Partly met?
Not met?
How can I improve on task 3?

22. Homework Homework task: Due date: Criteria for level 5:

23. Anagrams

24. Current and Voltage Current is measured in …
Amperes or amps or A
Current is measured in …
Current is measured using an …
which is shown by the symbol
Voltage is measured in …
Voltage is measured using an …......
ammeter A
Volts or V
Voltmeter V
Ammeter
Voltmeter
Volts
Amperes V A