S3 INNOVATION
ELECTRONICS
STARTER – IN YOUR GROUPS…
With the person sitting closest to the door writing down
your suggestions on the sheet of paper, the other members
of the group should each -
• Give an example of electronic devices that you own
• Give a brief description of what it does
• Explain how they would do the same things without this
device
LESSON TITLE: ELECTRONICS
Learning Intention:
To identify similarities in electronic devices
To understand the steps involved in every electronic device.
Activity: Building block diagrams
Success Criteria:
All – Remember the three stages involved in every electronic device.
Most – Follow block diagrams for electronic devices
Some – Will be able to design a block diagram for an electronic device
Electronic Devices
These are examples of electronic systems/devices.
Radio
Computer
Stopwatch
Calculator
Fire Alarm
Electronic Systems
All electronic systems have 3 parts:
 input
 process (or processor)
 output
input
process
output
Input
Detects some type of energy (eg. light, heat, sound)
and changes it to electrical energy.
This is then passed to the process.
What energy is detected in the following Inputs?
a) Microphone
b) Switch
c) Light Dependent Resistor
d) Thermistor
Can you think of other examples of INPUTS?
Process
Changes the electrical energy from the input so
that the system can do its job. This is then passed
on to the output subsystem.
Output
Converts the electrical energy from the
process subsystem into another type of energy
which can be used.
For example: heat, light, movement
What energy do the following outputs produce?
a) Loudspeaker
b) Light Bulb
c) LED
d) Motor
Can you think of more examples of outputs?
Block Diagrams
The easiest way to represent an electronic system is through
a block diagram.
Eg. The diagram below is for a calculator
Input
Process
Output
Keypad
Calculating
Circuits
Display
Activity
Can you make a block diagram for a Public Address System
Input
microphone
m
Process
aamplifier
Output
lloudspeaker
Smoke Detector
IInput
Smoke
Sensor
P
Process
O Output
Logic
Circuits
b
buzzer
Plenary
1.
What are the three stages of any electronic device?
2.
For tomorrow, draw a block diagram for one of the
following:
•
•
•
CD player
Radio
Stopwatch