1.3 Electrical Diagrams 2

• Meaning and importance of electrical diagrams in electrical technology
• Common symbols of electrical and electronic components used in domestic circuit diagrams
• Symbols for sources, switches, loads, protective devices and passive components
• Symbols for electronic components used in control and signal circuits
• Types of electrical drawings: schematic diagram, wiring diagram and line diagram
• Drawing electric circuit diagrams using standard electrical symbols
• Interpreting electrical circuit diagrams with respect to actual electrical components
• Symbols used on architectural plans and their relation to the actual layouts
• Drawing instruments, line types and lettering used in electrical diagrams
• Using basic software circuit kits to draw schematic diagrams
• Electrical drawings as a tool of communication in electrical technology

• illustrate symbols of common electrical components used in electrical technology
• describe the types of electrical drawings used in electrical technology
• draw electric circuit diagrams using standard electrical symbols
• interpret electrical circuit diagrams with respect to actual electrical components
• embrace electrical drawings as a tool of communication in electrical technology

“Why are electrical diagrams important in electrical technology?”

“How are different types of electrical symbols represented on architectural drawings?”

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1. Electrical diagrams and why they matter
   40 min · 1 practice tasks · quiz
   Introduce electrical diagrams and explain why they are important.
2. Symbols for sources and supplies
   40 min · 1 practice tasks · quiz
   Recognise the standard symbols for cells, batteries, d.c. and a.c. supplies, earth and junctions.
3. Symbols for switches and control devices
   40 min · 1 practice tasks · quiz
   Recognise the standard symbols for switches used to control a circuit.
4. Symbols for lamps and loads
   40 min · 1 practice tasks · quiz
   Recognise the symbols for lamps, bells, heaters and motors.
5. Symbols for protective devices
   40 min · 1 practice tasks · quiz
   Recognise the symbols for fuses, MCBs, RCDs and earthing.
6. Symbols for resistors, capacitors and inductors
   40 min · 1 practice tasks · quiz
   Recognise the symbols for passive components used in circuits.
7. Symbols for electronic components
   40 min · 1 practice tasks · quiz
   Recognise the symbols for diodes, LEDs, transistors and integrated circuits.
8. Building a chart of symbols
   40 min · 1 practice tasks · quiz
   Develop a chart of common electrical and electronic symbols.
9. Types of electrical drawings
   40 min · 1 practice tasks · quiz
   Describe the schematic, wiring and line diagrams and when each is used.
10. The schematic circuit diagram
    40 min · 1 practice tasks · quiz
    Draw and read a schematic circuit diagram using standard symbols.
11. The wiring diagram
    40 min · 1 practice tasks · quiz
    Draw and read a wiring diagram that shows the actual connections.
12. The line (single line) diagram
    40 min · 1 practice tasks · quiz
    Draw and read a line diagram of a supply system.
13. The block diagram
    40 min · 1 practice tasks · quiz
    Draw and read a block diagram of a system.
14. Symbols on architectural layout plans
    40 min · 1 practice tasks · quiz
    Identify electrical symbols on architectural plans and relate them to the actual layout.
15. Drawing instruments, lines and lettering
    40 min · 1 practice tasks · quiz
    Use drawing instruments and the correct line types and lettering in electrical drawings.
16. Interpreting a circuit diagram
    40 min · 1 practice tasks · quiz
    Relate the symbols on a circuit diagram to the actual electrical components.
17. Drawing with software circuit kits
    40 min · 1 practice tasks · quiz
    Use a basic software circuit kit to draw and test a schematic diagram.
18. Electrical drawings as communication
    40 min · 1 practice tasks · quiz
    Explain how electrical drawings are used as a tool of communication.