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Read & Understand
The Electrical Symbols
1
BY: ENGR. MART NIKKI LOU M. MANTILLA, REE, RME
Wires a n d connections
C o m p on e n t Circuit S y mbol Function of C o m p o n en t
Wire
To pass current very easily from one part of a
circuit to another.
Wires joined
A 'blob' should be drawn where wires are
connected (joined), but it is sometimes omitted.
Wires connected at 'crossroads' should be
staggered slightly to form two T-junctions, as
shown on the right.
Wires not joined
In complex diagrams it is often necessary to
draw wires crossing even though they are not
connected. The simple crossing on the left is
correct but m a y be misread as a join where the
'blob' has been forgotten. The bridge symbol on
the right leaves no doubt!
Power Supplies
Component Circuit Symbol Function of Component
Cell
Supplies electrical energy.
The larger terminal (on the left) is positive (+).
A single cell is often called a battery, but strictly a battery is
two or more cells joined together.
Battery
Supplies electrical energy. A battery is more than
one cell.
The larger terminal (on the left) is positive (+).
2
3
4
5
6
Mohd. Hanif Dewan, Chief Engineer and
Maritime Lecturer & Trainer, Bangladesh.
7/10/2014 7
8
9
10
Mohd. Hanif Dewan, Chief Engineer and
Maritime Lecturer & Trainer, Bangladesh.
7/10/2014 11
Mohd. Hanif Dewan, Chief Engineer and
Maritime Lecturer & Trainer, Bangladesh.
7/10/2014 12
13
14
15
16
LET’S READ A DIAGRAM
17
18
19
20
Mohd. Hanif Dewan, Chief Engineer and
Maritime Lecturer & Trainer, Bangladesh.
7/10/2014 21
22
23
24
25
26
27
28
29
Mohd. Hanif Dewan, Chief Engineer and
Maritime Lecturer & Trainer, Bangladesh.
7/10/2014 30
31
ANY QUESTION?
THANK YOU!
32

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Topic 10- Read and Understand Electrical Symbols and Diagrams.pptx

  • 1. Read & Understand The Electrical Symbols 1 BY: ENGR. MART NIKKI LOU M. MANTILLA, REE, RME
  • 2. Wires a n d connections C o m p on e n t Circuit S y mbol Function of C o m p o n en t Wire To pass current very easily from one part of a circuit to another. Wires joined A 'blob' should be drawn where wires are connected (joined), but it is sometimes omitted. Wires connected at 'crossroads' should be staggered slightly to form two T-junctions, as shown on the right. Wires not joined In complex diagrams it is often necessary to draw wires crossing even though they are not connected. The simple crossing on the left is correct but m a y be misread as a join where the 'blob' has been forgotten. The bridge symbol on the right leaves no doubt! Power Supplies Component Circuit Symbol Function of Component Cell Supplies electrical energy. The larger terminal (on the left) is positive (+). A single cell is often called a battery, but strictly a battery is two or more cells joined together. Battery Supplies electrical energy. A battery is more than one cell. The larger terminal (on the left) is positive (+). 2
  • 3. 3
  • 4. 4
  • 5. 5
  • 6. 6
  • 7. Mohd. Hanif Dewan, Chief Engineer and Maritime Lecturer & Trainer, Bangladesh. 7/10/2014 7
  • 8. 8
  • 9. 9
  • 10. 10
  • 11. Mohd. Hanif Dewan, Chief Engineer and Maritime Lecturer & Trainer, Bangladesh. 7/10/2014 11
  • 12. Mohd. Hanif Dewan, Chief Engineer and Maritime Lecturer & Trainer, Bangladesh. 7/10/2014 12
  • 13. 13
  • 14. 14
  • 15. 15
  • 16. 16
  • 17. LET’S READ A DIAGRAM 17
  • 18. 18
  • 19. 19
  • 20. 20
  • 21. Mohd. Hanif Dewan, Chief Engineer and Maritime Lecturer & Trainer, Bangladesh. 7/10/2014 21
  • 22. 22
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