Changing Circuits

1
Changing Circuits

• Electricity for year 6

http//www.westwightmiddle.iow.sch.uk/sci/6g/elec.
ppt
INDEX
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Index
lesson 1 Making a class circuit lesson 2 Making
circuits lesson 3 Electric current and
safety lesson 4 Fiddling with bits of
wire lesson 5 The brightness of bulb the speed
of motors lesson 6 circuit diagrams lesson 7
Resistance lesson 8 Is electricity
dangerous? lesson 9 Solving problems Lesson 10
Assessment
3
Revision

• Look at section 9 of the study book

4
Lesson 1
Making a class circuit.
5
Equipment

• Lengths of wire stripped at both ends.
• One light bulb in holder.
• One battery (three cells in a holder).
• One simple switch.
• Handouts.

6
Objectives
Know that a working circuit depends on a complete
circuit.
Know that electricity flows around a circuit in
one direction.
Know that a break in a circuit will stop
electricity flowing.
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By the end of the lesson
A careful drawing of the CLASS CIRCUIT.
Your best answers to some questions about the
CLASS CIRCUIT.
Homework Finish off your answers.
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Assessment
GOOD Your answers describe what you found out.
BETTER Your answers say a little about why
things happened.
FANTASTIC You have used your scientific
knowledge to explain why things happened.
9
Round ups

• This lesson I learnt
• What I dont quite understand is
• The bit I did best was
• I would like to know more about

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Lesson 2 Making circuits
Today, you will be making circuits using the
electrical components.
Why?
To learn what the parts are and how they fit
together.
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Equipment list
Electrical modules Crocodile wires Battery modules
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Components
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In your book
draw
add a caption
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Round ups
I know that I must have a complete circuit with
no breaks.
I know that a switch makes a break in the circuit
to stop the electricity flowing.
I know that good connections are important.
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Lesson 3

• To learn about how electricity flows.
• To get some idea about what electricity is.
• To learn about electrical safety.

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Equipment list.
Video Electricity with Ellie the
Electron Animation
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Video
Whats this video called?
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Key questions
In which direction did the electricity flow
around the circuit? The electricity flows What
is it that actually flows? (What particles?) The
particles that flow are called What part of the
wire does the electricity flow through? The part
of the wire the electricity flows through is
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How well did you do?
GOOD I was able to answer the questions. How
will the teacher know?
Better I used my scientific knowledge to answer
the questions. How will the teacher be sure?
Level 3
Level 4
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Lesson 4

• Fiddling with bits of wire

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Equipment

• For pupils working in pairs
• Three short pieces of wire
• Light bulb with no holder
• A single cell with no holder
• A switch with no wires or holder
• Handouts
• For demonstration on teachers bench
• One 12v transformer
• Lots of crocodile leads
• One light bulb in holder

22
Getting started...
We will be connecting up a big circuit to the
classroom tap but where does the electricity flow?
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Objectives
To learn exactly where wires connect to bulbs,
cells and switches.
To get the idea of connecting the components in a
circuit.
To learn how to add useful captions to your
drawings.
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A challenge!
To learn exactly where wires connect to bulbs,
cells and switches. To get the idea of connecting
the components in a circuit. To learn how to add
useful captions to your drawings.
Use the parts to make the bulb light.
Draw your working circuit. Try to make it clear
where the wires actually connect.
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Another challenge
To learn exactly where wires connect to bulbs,
cells and switches. To get the idea of connecting
the components in a circuit. To learn how to add
useful captions to your drawings.
Use all three pieces of wire and the switch.
Can you make the light work with the switch?
Another clear drawing please. Add a caption to
describe what the drawing is about.
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Testbase
Testbase worksheet Work in pairs
To learn exactly where wires connect to bulbs,
cells and switches. To get the idea of connecting
the components in a circuit. To learn how to add
useful captions to your drawings.
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Plenary Green, amber or red?
To learn exactly where wires connect to bulbs,
cells and switches. To get the idea of connecting
the components in a circuit. To learn how to add
useful captions to your drawings.

• Make a simple circuit with a few parts.
• Know where the wires should connect.
• Know what components are.
• Be able to draw clear diagrams.
• Be able to use a caption to describe what a
  diagram is about.

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Lesson 5

• The brightness of bulbs and the speed of motors

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Getting started

• Animation
• Look at page 69 of the STUDY BOOK.

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Objectives

• Learn what affects the brightness of a bulb.
• Learn how to change the speed of motors.

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What I am looking for

• By looking at your drawing and writing, I will be
  able to know what you understand.
• Clear drawings that show how the components are
  connected.
• Captions that explain how things work.

Learn what affects the brightness of a
bulb. Learn how to change the speed of motors.
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Drawings with captions that explain.
a clear drawing
a caption that explains
The bulbs in this circuit are quite dim. This is
because
Learn what affects the brightness of a
bulb. Learn how to change the speed of motors.
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Testbase / Revisewise

• Using example questions or bits from the
  Revisewise DVD.

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How well did you do?Fist of five

• My drawings are very clear. You can see what the
  components are and where the wires connect.
• My writing shows that I understand how to change
  the brightness of bulbs and the speed of motors.
• I finished my work on time.

Learn what affects the brightness of a
bulb. Learn how to change the speed of motors.
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Homework

• Revise page 69 of the Study Book and start to
  work through the questions on page 70
• Or
• Look at the BBC revision pages for electricity.

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Lesson 6

• Circuit diagrams
• This may take two sessions.

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Equipment

• Handouts
• Study guides
• Electrical kits
• Electricity table mats

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This lesson
Objectives
What I am looking for

• To learn the idea of drawing circuits with proper
  symbols.
• To learn to make circuits by using circuit
  diagrams.

• Your drawings are clear and have labels.
• You are confident about making the circuits shown
  in the diagrams.

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Circuit diagrams
Use your study guide.

• Look at the diagrams Spot draw the symbol for
  a battery (more than one cell).
• Spot and draw the symbol for a lamp (both types).
• Spot draw the symbols for an ordinary switch
  and a push switch.
• Spot and draw the symbol for a motor.
• Spot and draw the symbol for a buzzer.

6. Now use the equipment to make these circuits.
Draw them if theres time.
To learn the idea of drawing circuits with proper
symbols. To learn to make circuits by using
circuit diagrams.
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More complicated circuit diagrams
Use your study guide. Use the electrical modules
to try these. Show your teacher as you complete
each one.
To learn the idea of drawing circuits with proper
symbols. To learn to make circuits by using
circuit diagrams.
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Symbols and drawings
Draw proper circuit diagrams for these drawings.
To learn the idea of drawing circuits with proper
symbols. To learn to make circuits by using
circuit diagrams.
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Extending your ability

• Controlling circuits 1
• Controlling circuits 2
• Controlling circuits 3

Use your study guide.
To learn the idea of drawing circuits with proper
symbols. To learn to make circuits by using
circuit diagrams.
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Homework

• Page 68 of the STUDY BOOK
• Or
• Check out the electricity section of the BBC Key
  Stage 2 web site.
• Or
• Revision pages 34 to 40 in the work book.
• And
• Complete any unfinished work from this section.

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Round ups
See Science Simulations DVD of circuit diagrams.
Then use WHITEBOARDS to draw

• The symbol for one cell.
• A symbol for a bulb (lamp).
• A symbol for a switch.
• A circuit diagram with a 4½v battery, a lamp and
  a switch.

To learn the idea of drawing circuits with proper
symbols. To learn to make circuits by using
circuit diagrams.
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Lesson 7 Resistance
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What are we doing?

• Objectives

• What I am looking for

• To learn what happens when electricity flows
  through long wires.
• To learn how to write a relationship answer.

• Working as a team with different people.
• Writing a sentence about the relationship between
  the length of the wire and the brightness of the
  bulb.

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Equipment

• BBC Revisewise DVD
• Electrical kits

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Relationships
To learn what happens when electricity flows
through long wires. To learn how to write a
relationship answer.
Using BBC Revisewise DVD

• What is the relationship between the number of
  cells and the speed of a motor?
• How does the number of bulbs affect the
  brightness of the bulbs?
• What is the relationship between the sharpness of
  a saw and the time it takes to cut wood?
• How does the length of a car journey affect the
  amount of fuel you burn?

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Round ups
To learn what happens when electricity flows
through long wires. To learn how to write a
relationship answer.

• I am confident about how to answer relationship
  questions.
• I can describe how the length of the wire affects
  the brightness of the bulb.

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Lesson 8

• Is electricity dangerous?

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Equipment

• Handouts
• van de graf generator with mains cable and
  accessory kit
• Materials kits
• Croc leads
• 6v bulb in holders
• Battery modules
• Conductivity worksheet
• Mains plug (altered to prevent it from being
  plugged in)
• BBC Revisewise DVD

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Starter How powerful is electricity?
image 1 illustration of van de graf generator
Demonstration of a van de graf generator
You will learn much more about static electricity
in year 7
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Objectives

• To learn about insulation, conductors and short
  circuits.
• To learn about the dangers of electricity.

pause
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fire
shock
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Mains plugs
Inside a mains plug.

• Key questions
• Answer these questions as full sentences. (Some
  might need more than one sentence.)
• Why are wires covered in plastic?
• The long and thin wire we used last lesson was
  not covered in plastic. Why was this safe?
• Why is the outside part of a plug made from
  plastic?
• Why should you never touch electrical things with
  wet hands?

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Short circuits
What is a short circuit? What happens when you
get one?
image 1 image 2
image 3 image 4
image 5 image 6
Sometimes, the live and neutral wires come in the
direct contact because of damaged wiring. When
this happens, there is nothing to control the
current and a very large current flows. This is
known as Short Circuit.
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• Your teacher will show you what happens when you
  get a short circuit.
• Key Questions
• Answer as full sentences please. (Try not to use
  the word it).
• What happened to the thin wire when a fault
  occurred?
• Apart from shocks, why could electrical faults be
  very dangerous?
• Explain how the fuse works to keep you safe when
  a fault occurs.
• Why should you not use water on electrical fires?

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Input
BBC Revisewise DVD Electricity / Electrical
conductors insulators.
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Conductors insulators PRACTICAL

• .Touch the two loose ends onto the metal parts of
  some scissors.
• .Why does the bulb light up? What does this tell
  you about metal?
• .Now try the same test on a block of plastic.
  What do you know now about plastic?
• .Now try the materials to see if they carry
  electricity. Make a table of results and classify
  each material as
• A good conductor
• A weak conductor
• An insulator

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PlenaryWork in pairs using a mini whiteboard.

• Draw what could happen if you get a short
  circuit.
• What is the name of all materials that carry
  electricity well?
• What is the name of an electrical insulator we
  use a lot?

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Lesson 9

• Solving problems

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Objectives

• Learn how to use components and wires to solve
  problems.
• Learn how to draw circuit diagrams of circuits
  you have made.

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Expectations

• Work quickly to complete the whole assignment.
• Draw accurate circuit diagrams.
• Test circuits to find faults.

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Solving problems Part 1
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Solving problems Part 2
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Evaluation
fist of five

• I worked quickly and finished all the work.
• My drawings are accurate and clear.
• I was able to find and mend faults.

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Lesson 10 Assessment

• Unit test

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Equipment

• Unit test papers One per student.