Reading construction plan and other information.pptx

Presentation of electrical construction plan for learners of electrical installation and maintenance.

1. Let’s Review Identify the following electrical symbol that we’ve learned in our past lesson

2. B

3. A

4. C

5. D

6. B

7. Steps in Reading Electrical Wiring Plan 1. Familiarize with the Standardized Electrical Symbols Knowing what the symbols in your electrical drawing mean will help you find different appliances. Symbols usually resemble specific meaning. Familiarize yourself with descriptions for electrical appliances, understanding that different symbols appear for different objects. Refer to Basic Electrical Symbols and Their Meanings for specific resources and learn these symbols visually. You'd better get to know the following basic symbols by heart.

8. Steps in Reading Electrical Wiring Plan 2. Learn Reading Pattern Read schematics in the pattern that you would read text. With rare exceptions, schematics should be read left to right and top to bottom. The signal being generated or used by the circuit will flow in this direction. The user can follow the same path that the signal uses to understand what the signal does or how it is being modified.

9. Steps in Reading Electrical Wiring Plan 3. Identify Polarity Some components to a circuit board are polarized, meaning one side is positive and the other negative. This means you have to attach it in the specified way. For most symbols, polarity is included in the symbol. To identify the polarity of the physical part, a general rule of thumb is to find out which metal lead wire is longer. The longer part is the + side.

10. Steps in Reading Electrical Wiring Plan 4. Understand Names and Values Values help define exactly what a component is. For electrical components like resistors, capacitors, and inductors the value tells us how many ohms, farads, or Henries they have. For other components, like integrated circuits, the value may just be the name of the chip. Crystals might list their oscillating frequency as their value. Basically, the value of a schematic component calls out its most important characteristic.

11. Steps in Reading Electrical Wiring Plan Component names usually consist of one or two letters and a number. The letter part of the name represents the type of component - R's for resistors, C's for capacitors, U's for integrated circuits, etc. Each component name in an electrical drawing should be unique; if you have multiple resistors in a circuit, for example, they should be named R1, R2, R3, etc. Components names help us reference specific points in schematics. The prefixes of names are pretty well standardized. For some components, like resistors, the prefix is just the first letter of the component. Other name prefixes are not so literal; inductors, for example, are L's (because current has already taken I [but it starts with a C...electronics is a silly place]). Here's a quick table of common components and their name prefixes: