Chapter 1 - intro to schematics and symbols

defining and identifying schematics + explaining flow in a schematic

schematic symbol

simple sign for a device, connected by lines to represent a system

schematic

a line drawing made for a technical or scientific purpose that uses symbols and connecting lines to show how a system works

fluid

liquid or gas, anything that flows

direct current (dc)

electric current that flows in a single direction

alternating current (ac)

electric current that constantly reverses direction

what are the 5 parts that make a true schematic

1. a line drawing

2. made for a scientific or technical purpose

3. uses symbols instead of pictures

4. uses lines to connect the symbols, showing how the system operates

5. shows how a system works

why are schematics used?

1. simplify complicated systems into readable drawings

2. show relationships between components in a system by connecting lines

3. symbols and lines are standard so very little writing is needed

what are three major areas of schematics?

electrical, fluid power, and piping

if a drawing meets 4/5 parts of the definition of a schematic, and is still considered a true schematic? what might the drawing look like?

uses pictures or outline drawings of parts instead of symbols

what flows through a pneumatic system?

gas

what flows through a hydraulic system?

liquid

what are the four kinds of pneumatic and hydraulic diagrams?

1. cutaway diagram

2. pictoral diagram

3. schematic diagram

4. combination diagram

what are the two kinds of piping diagrams?

1. single line drawings

2. double line drawing

which of the piping diagrams doesn’t fulfill all 5 parts of a schematic? why?

the double line drawing, it’s a pictoral view of the pipes, joints, valves, and other components

in what direction do fluids flow?

from higher to lower pressure

in what direction does electricity flow?

from negative to positive charge

how would you trace the current in an alternating current?

looking for labels or colors (black, red, white)

what indicates flow in a piping diagram?

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