1. 50% of your final examination grade.
Learning how to recognise and understand common electronic input and output components .
Identification of electronic symbols is important when answering exam questions.
50% of your final examination grade.
Complete all tasks

2. Recap – Fill in the blanks
Input
Process
Output
Feedback
CLOSED LOOP
Name the system diagram and give an example?

3. Why do you think symbols are used?
Circuit Diagram
Electronic circuits are represented by circuit diagrams (see below)
The various components are represented as symbols (orange dots)
Components can be connected in series or parallel
Series
Parallel
Series circuits – current flowing through the two components is even, if one lamp/bulb breaks the other will too.
Parallel circuits – The components are connected in separate loops, the current is shared between each loop, if one lamp breaks the other will still work.
Why do you think symbols are used?

4. Example of Parallel Circuit – Streetlights
Series
Components (Orange) that are connected one after another
The current that flows across each component is the same
If one component fails the other will
Series
= Current flow
Parallel
Components (Orange) that are connected in separate loops (L1 & L2)
The current is shared between each component
If one component fails the other will work L1
Parallel L2
Example of Parallel Circuit – Streetlights

5. Input Symbols Symbol This is a simple on or off switch Input = Human
With this switch you have to push and hold to make the circuit work
Input = Human
Light activates this component and turns the circuit on or off
Input = Light/Dark
Heat activates this component and turns the circuit on or off
Input = Heat

6. Output Symbols
Symbol
Lights up when current passes through it, lots of colours available and very small. The long leg is positive and the shorter one is negative.
(LED)
Output= Light
Spins when current passes through it used to power a range of products
Plays sound when current passes through it
Buzzes when current passes through it

7. Other common Symbols
Used to power electric circuits
(energy storage)
Used to reduce the amount of current flowing to a component
The resistance can be changed by twisting this component
Can be programmed to do different tasks. Eg flash lights in different sequences

8. Identify The components2A 2B
2BC 2. 1A 1B 1C 1. 3. 3A 3C 3B
Explain what each circuit
does.

9. http://www. twothirtyvolts. org