PL AR RS P5L33 Electrical System WS

Primary 5

Rocket Science

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Tutor
Topic __________________________________________________

ELECTRICAL SYSTEM (LESSON 33)
ELECTRICAL SYSTEM (LESSON 33)

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

SIMPLE ELECTRIC CIRCUIT – NOTES

Fill in the blanks with the correct AR Model – Circuit

term. Choose the correct answer A simple electric circuit

from the list below.

conductor
closed circuit

electricity
insulator

load
switches
source
voltage

wire

A simple electric circuit is a system that allows the conversion of electricity into
various forms. The circuit is composed of the source, wire, and loads.

Components of a Simple Electric Circuit

The _________ is where the flowing electrons

come from. Electricity is produced when

electrons flow in a circuit. The simplest kind of

source in a circuit is a battery. Batteries store

chemical energy. When electrons inside the

Charged electrons inside the stored chemical energy flow, _________ is
negative side is ready to meet produced.

the positive side

Electrons flow when the positive
and negative terminals of a
battery meet in a circuit. Batteries
come in different sizes and
shapes. They also come in
different voltages. _________ is
the pressure from the power
source that pushes charged
electrons in a circuit.

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Primary 5: Rocket Science

SIMPLE ELECTRIC CIRCUIT – NOTES Insulator(rubber/plastic)
Conductor(copper)
Fill in the blanks with the correct
term. Choose the correct answer
from the list below.

conductor
closed circuit

electricity
insulator

load
switches
source
voltage

wire

In order for the electrons to flow, a pathway must be present. This pathway is a

_________. A wire is usually made up of two kinds of material - the conductor and
insulator. A _________ is a material that allows flowing electrons to pass through.
It is usually made up of metals. In a circuit the usual conductor is copper. Other

materials can also act as conductor in a circuit. Sometimes muddy water or wet

hands can become a conductor.

An _________ is a material that prevents the flow of electrons. In a circuit, an
insulator is plastic or rubber.

Another important part of a circuit is the load. This component converts flowing
electrons into other forms of energy. A light bulb is a good example of a
_________. It converts electricity to light.

When the source, wires, and load are properly connected in a circuit, these can
convert electricity into useful forms.

electricity AR Model – Torchlight

light

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Primary 5: Rocket Science

SIMPLE ELECTRIC CIRCUIT – NOTES

Fill in the blanks with the correct These are examples of loads in a circuit that
convert electricity to other forms.
term. Choose the correct answer
The horn can convert electricity to
from the list below. sound due to motion of air particles.

conductor
closed circuit

electricity
insulator

load
switches
source
voltage

wire

This stove converts flowing AR Model – Motor
electrons into heat.
This motor converts electricity

into motion for spinning.

Other part of a Circuit
A simple circuit must be in a loop if we need to have a conversion of electricity to
different forms. A circuit can either be open or closed. A _________ happens when
electricity flows continuously in a loop. An open circuit happens when there is a

gap in the flow of electrons. In order for us to easily control the circuit, we use
switches. _________ help make the circuit open or closed.

No gap in the flow of electricity the flow of electricity is broken
(closed circuit) (open circuit)

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Primary 5: Rocket Science

SIMPLE ELECTRIC CIRCUIT – NOTES
Switches come in different sizes and forms. All these help control the flow of
electricity in a circuit.

The Short Circuit
A short circuit is dangerous because it
can cause explosion, fire, or injury. This
happens when the flowing electrons
accidentally goes into a shortcut towards
the source. The wires or the source
becomes a load where electrons are
pushed against each other too fast that it
heats up and explode. Always make
sure that all the parts in a circuit are
properly connected.

This piece of wire allows
electricity to pass through
without resistance. The electrons
move too fast causing too much
heat. This may result in build up

of heat

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Primary 5: Rocket Science

SIMPLE ELECTRIC CIRCUIT – NOTES
The Circuit Diagram Symbols
Using symbols, we can easily plan/study a circuit without drawing each component
every time we need to make a circuit.

BATTERY

The long line
denotes the
positive terminal
of a battery

The short line
denotes the
negative terminal
of a battery

Light Bulb

A light bulb can OR
have these
symbols

Wire A wire can simply
Switches be shown as a
line
No gap shows a
A gap shows an closed switch
open switch

7

Primary 5: Rocket Science OEQ

VIDEO - Electric Circuit

https://www.youtube.com/watch?v=VnnpLaKsqGU
Discussion Questions:
1. What are the parts that make up the circuit?
2. Which part of the circuit produces heat and light energy?
3. What kind of circuit do we have if there is no broken path?
4. What may happen if the wire is not covered by an insulator?

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Primary 5: Rocket Science OEQ

Activity 1: Hands-on Activity
Electric Circuit Simulation
Materials
Phet.colodaro.edu simulation for electric circuit
Link: https://phet.colorado.edu/sims/html/circuit-construction-kit-dc-virtual-lab/latest/circuit-
construction-kit-dc-virtual-lab_en.html
Instructions:
1. Open the link above.
2. On the left side box, click on a battery and place it standing on the left near the center of

the screen. The orange part (positive terminal) should be facing up.
3. On the left side box, click on a light bulb and place it to the far right side of the battery.

The bottom tip of the bulb should be facing the side of the battery.
4. What is missing for us to make a circuit?

_____________________________________________________________________
5. Drag a wire on the left box and connect it on the positive terminal of the battery.
6. Connect the other end of the wire into the bottom tip of the light bulb.
7. Get another wire on the left box and connect it on the negative terminal of the battery.
8. Connect the other end of the wire into the side of the light bulb. What can you say about

the flow of the electrons?
_____________________________________________________________________
9. What is produced when electrons flow through the filament in the light bulb?
_____________________________________________________________________

9

Primary 5: Rocket Science OEQ

Activity 1: Hands-on Activity
Electric Circuit Simulation
Materials
Phet.colodaro.edu simulation for electric circuit
Link: https://phet.colorado.edu/sims/html/circuit-construction-kit-dc-virtual-lab/latest/circuit-
construction-kit-dc-virtual-lab_en.html

Instructions:
10. Click on the wire that is connected to the negative terminal of the battery and choose

the trash icon. What happens to the flow of electrons?
____________________________________________________________________
11. This time click on the switch on the left box and place it in-between the battery and light
bulb.
12. Drag a wire and connect it to the negative terminal of the battery and the left end of the
switch. Again get a wire and connect it to the right side of the switch and the side of the
bulb.
13. What happens to the circuit when you click on the switch?
____________________________________________________________________
14. Click on the switch again. What happens to the circuit?
____________________________________________________________________
15. Get another wire and connect it to the positive terminal of the battery. Connect the
other end of the wire into the left end of the switch. What happens to the circuit?
____________________________________________________________________
16. What could happen if you leave the circuit like this?
____________________________________________________________________

10

Primary 5: Rocket Science OEQ

Activity 1b: Hands-on Activity
Electric Circuit Simulation
Copy the circuit below using the simulator. Click on the down button on the left box to test each
of the materials listed on the table. Connect each material between ends A and B. Complete the
information in the table.

Material Is the material a conductor or an insulator?

dollar note
paper clip

coin
eraser
pencil

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Primary 5: Rocket Science

Activity 2 - MCQs

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Primary 5: Rocket Science

1. What does this symbol represent?

(1) Bulb ()
(2) Wire
(3) Switch
(4) Battery

2. Which transformation is most likely to occur in the steam iron?

(1) Electrical energy changes to heat energy
(2) Electrical energy changes to sound energy
(3) Mechanical energy changes to electrical energy
(4) No transformation occurs

()

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Primary 5: Rocket Science

3. Which statement is true?

(1) The light bulb will not light up because the circuit is broken.
(2) The light bulb will not light up because the circuit is complete.
(3) The light bulb will light up because the circuit is broken.
(4) The light bulb will light up because the circuit is complete.

()

4. The electrician in this picture is wearing rubber gloves for protection. What is the purpose
of the rubber gloves?

(1) To produce electricity ()
(2) To protect the electrician
(3) To keep the electrician dry 14
(4) To create an electrical circuit

Primary 5: Rocket Science

5. David constructed this circuit. Which of these objects would most likely make the light
glow when connected to points X and Y?

Y X

(1) Plastic straw
(2) Aluminum foil
(3) Rubber eraser
(4) Cotton string

()

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Primary 5: Rocket Science
6. What items are needed to build a simple circuit like the one shown below?

(1) Some wire , some switches, one light bulb and two batteries ()
(2) A battery, 2 light bulbs, some wire
(3) A battery, one light bulb, one switch and some wire
(4) Wire, apples, lights, batteries

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Primary 5: Rocket Science

7. Electricity is a form of energy that can be changed into other forms of energy, including
__________, __________, __________, __________.

(1) heat, air, tires, fans
(2) solid, liquid, gas, plasma
(3) light, heat, sound, motion
(4) cooling, running, freezing, motion

()

8. This circuit has a battery, buzzer, and switch. When the switch is closed the buzzer will
sound because ____________.

(1) the buzzer is made of special plastic
(2) electricity can flow in a complete path
(3) the switch gives energy to the battery
(4) the wires are cooled by the surrounding air

()

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Primary 5: Rocket Science

9. Which bulbs will light?

(1) 1 and 2 ()
(2) 2 and 3
(3) 3 and 4
(4) 1 and 3

10. A steel paperclip would allow electricity to flow through it because:

(1) It is magnetic
(2) It is a conductor
(3) It is an insulator
(4) It breaks the circuit

()

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Primary 5: Rocket Science

Activity 3 – Open-ended questions
1. Analyze the circuit. Answer the questions about the circuit.

Will the bulb light up?
____________________________________________________________________
What could be the possible problem in the given circuit?
____________________________________________________________________
What can we do to solve the problem?
____________________________________________________________________
2.

What is missing in this circuit?
____________________________________________________________________
Name all the components of this circuit.
____________________________________________________________________

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Primary 5: Rocket Science

ACTIVITY 4: Fun Facts – Kid’s Safety

https://www.youtube.com/watch?v=Pr9YntO7V1U Answer

Discuss 20

Before the video How important is electricity to you?

01:16 Why does sticking any metallic
01:38 objects into outlets, gadgets, or
02:07
03:29 appliances cause accidents?
03:54
Why is it unadvisable to put many
plugs in an outlet?

Why do you think water should not
mix with electricity?

Who can you call for help in your
area when there is a problem with

electricity?
What else can you suggest to keep

yourself safe when using
electricity?