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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
  • The Tester Breadboard

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
  • Load
  • 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
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