Electrical workshop module3

Eng. Rose Hasan

Electrical Workshop Module 3: Basic Electrical Components (1-week)

ATE 1012Grade 10

Module Objectives

Identify basic electrical components such as: Lamps, motors and buzzers. Resistors, LDRS, capacitors and

inductors. Diodes.

Understand the applications of each component.

Understanding components’ coding.Eng. Rose Hasan

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Module Contents

Introduction Basic Electrical Components Components Coding Class and Lab Activities

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Introduction

Have you ever opened your personal computer (PC) or your radio from the inside?

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Electrical Components

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Electrical Components

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Electrical Components

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Electrical Components

Video

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Electrical Components

Components Coding:

Resistance Coding: Resistors are specified by their:▪ Resistance Value ▪ Tolerance

It is indicated by: color code method.

Resistance is measured in _____ ?_____.

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Components Coding: Cont…

Most resistors have 4 bands:▪ The 1st band gives the

first digit.▪ The 2nd band gives the

second digit.▪ The 3rd band indicates

the number of zeros.▪ The 4th band gives the

tolerance

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Resistor Color Code

Exercises:

State the resistor’s value and tolerance for the following resistors:

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R= R=

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Exercises:

R= R=

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Exercises:

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Resistor Color Code Calculator

http://samengstrom.com/nxl/3660/4_band_resistor_color_code_page.en.html

Search the net for resistor color code calculator and post it on my Wiki….

http://mywork-iat.wikispaces.com

Components Coding:

Capacitor Coding: Capacitors are usually specified by three quantities: _______________________ _______________________ _______________________

A number code is often used on small capacitors where printing is difficult. The 1st number ______________________ The 2nd number ______________________ The 3rd number is _______________________

The code gives the capacitance in _________________ Remark: Ignore any letters - they just indicate tolerance

and voltage rating.

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Example

You have a capacitor with "104" stamped on it.

The first two digits are: ______ The third digit is: _______ The forth digit is:__________ So, C=__________________

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Exercises:

State the capacitance value for the following capacitors:

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Exercises:

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Activity 1: Identify resistors from color code

Items Required:

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Activity 1: Identify resistors from color code (Steps)

Using the color coding method, identify the resistance value of various resistors

Fill the table below:

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Activity 2: Identify capacitance for various capacitors

Items Required:

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Activity 2: Identify capacitance for various capacitors (Steps)

Identify the capacitance value of various capacitors. Fill the table below:

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Review Basic Electrical Components

Component Symbol Function Component in the Lab

A

B

C

D

E

F

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Find the resistor value:

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Find the capacitor value:

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Finding the Resistance Value using the Resistor Color Wheel

0 1

2

3

4

56

7

8

9

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Practical Activity: Find the Resistance & the Capacitance values

Items Required:

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Steps:

First Band color and

value

Second Band color and value

Third band color and

value

Forth band color and

value

Resistance

Value stamped on the capacitor

Capacitance

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Activity 3: light intensity control using potentiometer

Items Required:

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Activity 3: light intensity control using potentiometer (Steps)

Connect the following circuit:

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Activity 3: light intensity control using potentiometer (Steps)

Rotate the spindle of the potentiometer. What do you observe on the light brightness?

-------------------------------------------------------------------------------------------------------------------- State an application of potentiometers?----------------------------------------------------------

--------------------------------------------------------How can you know the resistance

range of the potentiometer ???

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Activity 4: Demonstrate LDR Operations

Items Required:

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Activity 4: Demonstrate LDR Operations (Steps)

Connect the following circuit:

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Activity 4: Demonstrate LDR Operations (Steps)

Expose the LDR to light. What happen to the brightness of the lamp?

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Put the LDR in the dark. What happen to the brightness of the lamp?

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State some applications of LDRs.---------------------------------------------------------------------

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Future Plan

Write your opinion about today’s class on my Wiki …

Be prepared to a Quiz next Class in module #3.

Next Class: Start with Module #4

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Electrical Motor

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Resistors