# Introduction to Electronics - PowerPoint PPT Presentation

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## Introduction to Electronics

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### Introduction to Electronics Basic Electrical Circuits Basic Units Safe Levels Voltage Current Unit prefixes Measuring Devices The Tester Breadboard Lesson 1 Basic ... – PowerPoint PPT presentation

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Title: Introduction to Electronics

1
Introduction to Electronics
• Basic Electrical Circuits
• Basic Units
• Safe Levels
• Voltage
• Current
• Unit prefixes
• Measuring Devices

2
Lesson 1
• Basic Electrical Circuits
• Basic Units
• Safe Levels
• Voltage
• Current
• Unit prefixes
• Measuring Devices

3
Electricity
• An electric current is produced when electric
charges move in one direction
• It is measured either in Voltage and Amps

4
Circuits
• Currents require complete conducting paths.
• These paths are called circuits

wires are used to connect components
Battery
5
Circuits
• Every circuit requires these three things
• Power Source
• Conductor (wire)
• A circuit may include a control device such as
a switch

6
Circuits
• Some of the components you will be using are
• Battery, resistor, capacitor, Integrated
Circuits, L.E.D.

7
The Three Main Quantities
• Voltage, symbol - V, units - Volts
• Provides the push
• Current, symbol - I, units - Amperes (Amps)
• Flow of Electrons
• Amount of Current is dependent on Voltage and
Resistance
• Resistance, symbol - R, units - Ohms (O)
• Limits the amount of current
• Represents the load of the circuit

8
Safe Levels
• Voltage 30 V
• Voltages inside a computer do not exceed 12 V,
except at the power supply and power switch,
which could be at 120 V, depending on computer
style.
• Be careful in these areas!
• Do not attempt to open monitors!
• Current 5 mA (0.005 Amperes)

9
Voltage Can Be Provided From
• Voltage Regulator 7805
• a battery 9V

Converts 9V to 5V
• a conventional power supply
• a computer power supply

Red 5V Yellow 12V Black Ground
10
Current
• is simply the flow of electrons
• Direction depends on convention
• Electron flow is from (-) to () (flow of
electrons)
• Conventional flow is from () to (-) (hole flow)

11
Unit Conversions and Prefixes
• Sometimes Volts, Amps, and Ohms are either too
big or too small prefixes are used.

Prefix Multiply by X
Giga (G) 1 000 000 000 One billion 109
Mega (M) 1 000 000 1 million 106
Kilo (k) 1000 1 thousand 103
milli (m) 0.001 1thousandth 10-3
micro (µ) 0.000 001 1 millionth 10-6
nano (n) 0.000 000 001 1 billionth 10-9
pico (p) 0.000 000 000 001 1 trillionth 10-12
12
Measurement
• Voltage, Current and Resistance are measured
using a meter.
• We use a Digital Multi-meter (DMM)
• Settings need to be adjusted depending on the
measurement being performed
• You must use the correct setting

13
Meters
14
Voltmeter
Measuring Voltage Use the meter to measure across
a component (in parallel) e.g. a battery
15
Ammeter (current)
• You use an ammeter to measure current
• You put the meter inline with the component (in
series)

16
Resistance
• You measure resistance across a component

17
Questions
• Convert the following

Basic Unit Prefix Unit
0.034V
3600?
0.000009A
12000A
5,600,000?
0.00004V
3 µV
5mA
8 kV
6.2K?
1.8M
4.7mA