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ELECTRONIC CIRCUITS FOR GRADE 9 Prepared by G. C. Accom
SOME OF THE SYMBOLS WE WILL USE
How to make a simple cell-holder for batteries USE A PIECE OF RUBBER HOSE AND A KNIFE
CUT A SLIT INTO THE HOSE
SLIDE THE NUMBER OF CELLS YOU NEED INTO THE SLIT YOU HAVE CUT
I GRADE 9 YOU WILL BE WORKING WITH THE FOLLOWING POWER SOURCES EXPLAIN TO LEARNERS WHY WE SAY THESE CELLS ARE CONNECTED IN SERIES
A SIMPLE CIRCUIT WITH CELLS CONNECTED IN SERIES PUSH SWITCH ALWAYS ON SWITCH MADE WITH PAPER CLIP AND THUMB TACK TOGGLE SWITCH PUSH SWITCH ALWAYS OFF
PUSH SWITCH Normally ON in its normal state
It switches OFF when you press it
PUSH SWITCH Normally OFF in its normal state
It switches ON when you press it
CIRCUIT DIAGRAM FOR TWO CELLS CONNECTED IN SERIES
CELLS CONNECTED IN PARALLEL Switch Open
CELLS CONNECTED IN PARALLEL Switch Closed
BULBS CONNECTED IN SERIES
SEE WHAT HAPPENS WHEN ONE BULB IS REMOVED
BULBS CONNECTED IN PARALLEL
SEE WHAT HAPPENS WHEN ONE BULB IS REMOVED
AND SWITCH – Both Open
AND SWITCH – One Closed
AND SWITCH – Both Closed
OR SWITCH – Both Open
OR SWITCH – Bottom switch closed
OR SWITCH – Top switch closed
OR SWITCH – Both switches closed
4,5 v battery, switch, resistor and LED
LDR, buzzer, 3v battery
Buzzer sounds when light of torch is brought close
LDR with LED
LED is ON in absence of LIGHT
LED is OFF in presence of LIGHT
Circuit with switch, resistor, capacitor, diode & LED NOTE- LED is OFF
NOTE- LED is ON
NOTE POWER SUPPLY IS REMOVED BUT - LED is still ON
TOUCH OR MOIST DETECTOR SWITCH OPEN = LED OFF WATER
SWITCH CLOSED = LED ON WATER
YOU CAN USE EXACTLY THE SAME CIRCUIT TO ADD A BUZZER WATER CONNECT TERMINALS OF BUZZER HERE
A Picture Diagram of a Torch
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Chapter 16:Electricity Section 3 – Circuits. – Definition: circuit – a set of components that allow one or more complete paths for electric current to.
© Oxford University Press 2011 IP Images Images.
LEFT CLICK OR PRESS SPACE BAR TO ADVANCE, PRESS P BUTTON TO GO BACK, PRESS ESC BUTTON TO END LEFT CLICK OR PRESS SPACE BAR TO ADVANCE, PRESS P BUTTON.
ELECTRICAL CIRCUITS. What is an electric current? An electric current is a flow of electrons through wires and components. + - In which direction does.
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Electricity Circuits. Learning Goals I will be able to identify both series and parallel circuits. I will be able to draw circuit diagrams.
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Measuring Voltage and Current Aims Know the units of voltage and current Know how to measure voltage and current.
Electric Circuits Road Signs - USA Road Signs- France Road Signs- Mexico Hazard Symbols Road Signs- UK Washing Symbols What do these represent? Why do.
What is a circuit? A set of connected electrical components that provide one or more complete paths for the movement of charges. A set of connected electrical.
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ELECTRICAL CIRCUITS. The CELL The cell stores chemical energy and transfers it to electrical energy when a circuit is connected. When two or more cells.
Topic 2 Electricity Within a Circuit. Static and Current Electricity: When charged particles build up in an object it is called static electricity. Another.
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Current Electricity 1. What is Electric Current? Electric current is the flow of electricity through a conductor. The current is caused by the movement.
IB Physics 12 Mr. Jean November 5 th, The plan: Video clip of the day More on circuits Looking through components.
Current Electricity - Symbols Draw the symbol for each electrical device.
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An electric circuit can be represented using a diagram. Each part of the circuit is represented with a symbol. By reading a circuit diagram, it is possible.
Current Electricity - Symbols Identify the Symbol.
You will need: your science journal a pencil a smile.
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CAPACITORS & RESISTORS. RESISTORS A resistor, like batteries and lights, can also be present in an electrical circuit. A resistor limits the flow of electricity.
Discovery Kits: Electricity. 1.5 V Battery Batteries in series Closed switch Open switch V Motor Components.
Circuit Game Answers. 1. Complete Parallel Circuit.
Unit 8 - Circuits. Circuit Diagrams Circuits: made up of wires and parts such as ________, light bulbs, _______, or switches. When diagramming circuits,
Physics 12 Mr. Jean November 13 th, The plan: Video clip of the day Drawing circuits Working with circuit diagrams Basic Ohm’s Law.
Name ______ 6 __ Jan. __ Lesson 4B – How Batteries Work.
Do you think that this bulb will light up? Build the circuit and check your prediction Fix the circuit so that the bulb does light up. A.
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