S3 INNOVATIONELECTRONICS

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 devicesTo 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 theprocess 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

Keypad CalculatingCircuits

Display

I nput OutputProcess

Activity

Can you make a block diagram for a Public Address System

a l

I nput OutputProcess

mmicrophon

e

amplifier loudspeak

er

Logic Circuits

b

I OP

Smoke Sensor

Smoke Detector

buzzer

Input Process Output

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