PL AR RS P5L29 Electrical System WS

Primary 5

Rocket Science

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Tutor
Topic __________________________________________________

ELECTRICAL SYSTEM (LESSON 29)
ELECTRICAL SYSTEM (LESSON 29)

Primary 5: Rocket Science

Lesson Outline
• Notes
• Activity 1: Hands-on Activity
• Activity 2: MCQS
• Activity 3: Open-ended Questions
• Activity 4: Fun Facts

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Primary 5: Rocket Science

ELECTRIC CIRCUIT – NOTES

A simple ___________ is a system
that exhibits the capability of
electrical energy to be converted into
other forms. It is composed of
several parts such as the energy
source, wires, switch, and a load.

Simple Electric Circuit

Parts of Electric Circuit

The simplest form of energy source in a circuit is a ______. It contains chemical energy that
can be converted into electrical energy. This energy causes the charges to move in the circuit.
It has two terminals - a positive and a negative terminal. The electric current flows from
_________ end of the battery, through the wires and loads, and back to the _________ end of
the battery.

Different Sizes of Battery Lesson

_______________ serves as a passageway for Electrical Wires
_________. It connects the two terminals of the
battery to other electrical components so that
electric current can flow within the circuit. They
are usually made of copper.

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Primary 5: Rocket Science

A _________ could be any device that Filament
allows electrical energy to be converted

into other forms of energy. Most common

example of a load is a ____________. AR Model –
When metal casing and metal tip are Glass cover Lightbulb

connected properly in a circuit, the Metal casing

current flows through the

_____________ increasing its

temperature. It becomes hot, and energy

leaves the filament in the form of

____________. Metal tip

Bulb

A ________ opens and closes a circuit. AR Model –
It turns the load on and off by connecting Fluorescent
and disconnecting the electrical path
(wires) in a circuit. Lamp

Switch

Animation

Open Circuit Closed Circuit

A circuit will only work if the components are properly connected. The electric current can
flow though a circuit if there is no gap between the parts of a circuit. When the battery and
bulb are properly connected with wires and there are no gaps in between, the circuit is a
______________.

When there is a gap between parts of a circuit, the bulb will not light up. The electric
current cannot flow though it. In this case, the circuit is an ______________.

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Primary 5: Rocket Science

Metals such as copper, iron, aluminum, silver, and gold allow Copper
electric current to flow freely from them. These materials are wire
called ________________. The most commonly used
conductors are copper which can be found in most of the Plastic
wires. insulator

Meanwhile, materials such as plastic, glass, and ceramic Conductor and insulator in a wire
does not allow the flow of current though them and has a
very high electrical resistance. Such materials are called
_________________ . Electrical wires are usually coated
with rubber or plastic to avoid electric current to flow outside
or to the person who touches it.

Lesson

Engineers and electrical workers use _______________ to easily show an electric circuit. It
uses symbols to show an electric circuit connection.

Circuit Diagram

Symbols in Circuit Diagram Animation

Components Symbol (Note: Longer vertical line is
the positive terminal while
Battery the shorter one is the
Bulb negative terminal)

Wire Components of Circuit
Switch

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Primary 5: Rocket Science

VIDEO - The Power of Circuits

https://www.youtube.com/watch?v=VnnpLaKsqGU
Discussion Questions:
1. What is an electric circuit?
2. How does the electricity flow through the circuit?
3. How does electrical energy transform in the circuit?

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Primary 5: Rocket Science

Activity 1: Hands-on Activity
Simple Electric Circuit
Materials
• LED Light
• 2 pcs of 3-V Battery
• Wires(from old computer speaker wires or other old wires with the same diameter)
• Electrical tape
• Pliers
• Materials such as: eraser, 3 glasses distilled water, metal clip, rubber band, salt, sugar

Instructions:
1. Prepare 3 pieces of 5-inch long wires.
2. Strip off about 1-inch of the insulation of the wire. Watch the video on how to strip off

the wires.
Video link: https://www.youtube.com/watch?v=t-2gchJfynE
3. Connect the batteries. The negative terminal of the other battery should connect to the
positive terminal of the other battery.

4. Create the circuit shown in the illustration below.

Wire A

Wire B

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Primary 5: Rocket Science

5. Put the following materials in the gap. Observation

Materials
Eraser

Metal clip
Rubber band

6. Prepare the following liquid solution.

A. A glass of distilled water
B. 3 tbsp of salt dissolved in a glass of distilled water
C. 3 tbsp of sugar dissolved in a glass of distilled water

7. Submerge the end of Wire A and Wire B in the liquid solution prepared in number 6.
Make sure to wipe the end of the wire before submerging to the next solution.

Materials Observation
Distilled water
Salt solution
Sugar solution

8. Finally, connect Wire A and B.
(a) Draw the circuit diagram of circuits you made. Label the parts on your observation.

(b) How would you classify the materials and solutions used in the experiment based
on your observation?
_________________________________________________________________
_________________________________________________________________

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Primary 5: Rocket Science

(c) In which solution/s did the light bulb light up? Why do you think it lighted up in some
solutions?
____________________________________________________________________
____________________________________________________________________

(d) How would you compare the circuit before and after you connected the wire A and
solutions?
____________________________________________________________________
____________________________________________________________________

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Primary 5: Rocket Science

Activity 2 - MCQs

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Primary 5: Rocket Science

1. Study the illustration below.

All the components shown are new and in working conditions. However, the light bulbs did

not light up.

Which of the following statements best describes the problem in the circuit?

(1) Bulbs are not properly arranged. ()
(2) Batteries are not properly arranged.
(3) There was no switch to close the circuit.
(4) The number of wires used was not enough.

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Primary 5: Rocket Science

2. Mark build a circuit as shown below.

Bulb C Bulb B Bulb A

CB A

D

He observed that only bulb B2 lighted up.
Which object were used in the set-up above?

Object A Object B Object C Object D
(1) Metal clip Coin Rubber band Marble
(2) Marble
(3) Rubber band Metal clip Coin Rubber band
Coin Marble Metal clip

(4) Coin Marble Metal clip Rubber band

( )

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Primary 5: Rocket Science

3. John is assigned to set-up a simple electrical circuit that could ring a buzzer. He chose
the following items to construct the electrical circuit.

Buzzer Wires Switch Battery

Which item listed above can he remove such that the buzzer can still ring in the circuit?

(1) Buzzer
(2) Wires
(3) Switch
(4) Battery

( )
)
4. Karl is on a quest to find out how the arrangement of bulbs in a circuit affects the

brightness of the bulbs. Which of the following should be kept constant for a fair
experiment?

A. Number of bulbs
B. Brightness of bulbs
C. Number of batteries
D. Arrangement of bulbs

(1) A and C only
(2) A and D only
(3) B and C only
(4) A, B, C, and D.

(

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Primary 5: Rocket Science

5. Which of the following materials are conductors of electricity?

A: Copper
B: Cotton
C: Glass
D. Rubber
E. Steel

(1) A and C only ()
(2) A and E only
(3) B, D and E only
(4) B, C and D only

6. Will all the bulbs in the following circuit have the same brightness?

Circuit 1 Circuit 2 Circuit 3 Circuit 4 Circuit 5
()
(1) Yes, because they all have the same arrangement.

(2) No, because only Circuit 1 and Circuit 3 will light.
(3) No, because only Circuit 2 will light.
(4) No, because only Circuit 3 and Circuit 5 will light.

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Primary 5: Rocket Science
7. What is the name of this piece of equipment and how does this affect the current?

(1) This represents a bulb, it transform electrical energy to heat and light energy )
(2) This represents a battery, it provides electrical energy in the circuit
(3) This represents an open switch, the circuit is not complete when this is

connected in the circuit.
(4) This represents a closed switch, the circuit is complete in this switch.

(

8. Which of the following should not be touched when connected to an electrical circuit to
avoid being electrocuted?

(1) Coin ()
(2) Towel
(3) Needle
(4) Ice-cream stick

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Primary 5: Rocket Science

9. Dino set up a simple electric circuit as shown in the illustration below.

batteries buzzer

material
He changed the material in the circuit. His observations are shown in the table below.

Material Did the buzzer ring?
A Yes
B No
C Yes
D No

Which of the following shows the correct classification of the materials?

Conductor of Insulator of Electricity
Electricity

(1) A B, C and D

(2) A and C B and D

(3) B and C A and D

(4) C and D A and C

( )

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Primary 5: Rocket Science

10. Study the diagram below.
A

B

C
D

Which circuits will allow electric current to flow in the circuit?

(1) A and D only
(2) B and D only
(3) C and D only
(4) A, B and C only

()

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Primary 5: Rocket Science

Activity 3 – Open-ended questions

1. A loop game in an amusement park is set up as shown below. The player has to move
the handset along the metal loop from end to end without touching the metal loop.
When the buzzer sounds and the light bulb lights up, the player will lose the game.

Metal loop

Ring of
handset

Handlebar
of handset

Wire V Wire Z

Wire W Wire Y

buzzer

Battery 1 Battery 2

Wire X

(a) Study the diagram. Give two reasons why the metal loop game will not work as

intended. [2]

Reason 1:
________________________________________________________________
________________________________________________________________

Reason 2:
________________________________________________________________

______________________________________________________________

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Primary 5: Rocket Science

(b) In order to play the game, what kind of material should be used for the ring of the
handset? Explain your answer. [2]

________________________________________________________________

________________________________________________________________

(c) Suggest a change to the set up that will make the game more difficult to win without
[1]
changing the pattern of the metal loop.

________________________________________________________________
________________________________________________________________

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Primary 5: Rocket Science

2. Before putting a truck in a cargo vessel its mass is being checked. A device is used to
ensure that trucks do not exceed a capacity of 5000kg. If a truck exceeds the limit, a
spring will be pressed and a buzzer sounds.

Upper contacts spring
plate

spring

Lower
plate

buzzer

Set-up X

(a) What type of material are the contacts made of? [1]

_______________________________________________________________

(b) Which component of a simple electrical circuit has the same function as the [1]
contacts?

________________________________________________________________

(c) Explain how the buzzer could be turned on. [2]

________________________________________________________________

________________________________________________________________

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Primary 5: Rocket Science
ACTIVITY 4: Fun Facts – The Science of Static Electricity?

https://www.youtube.com/watch?v=yc2-363MIQs​

Discuss Answer

Before the video Why do we sometimes
experience a tingling effect
0.46
0.57 when we touch a metal?

How are loose electrons
able to leave the object
when attached to others?

What happens when
electrons leave the object?

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Primary 5: Rocket Science

1:20 How do two charged objects
1:37 react with each other?
2:40
What is static discharge?

Is static electricity
dangerous?

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