Basic Electronics

Requirement for a Complete Circuit

SourceBattery, Generator, AC Voltage source, Photovoltaics,

etc.Load

Light bulb, motor, buzzer, heater, LED, LCD, Digital Circuit, etc.

ConductorsSwitch

Slide, momentary, toggle

Energizer

+

_

Schematic Diagrams

+ 10V

Energizer

+

_

TERMS, SYMBOLS AND UNITS OF MEASUREMENT

Term Description Symbol Unit of Meas. Symbol

Charge Quantity of Accumulated Electrons Q Coulombs C

Voltage Electromotive Force E/V Volts V

Current Rate of Electron Flow I Amps A

Resistance Opposition to Electron Flow R Ohms Ω

Power Rate of doing Electrical Work P Watts W

Flow of Electrons in a copper wire

Using a Multimeter: Measuring Resistance

Using the Ohmmeter

1.Measures resistance in a circuit.2.The circuit must be “dead.”3.Choose the setting on the meter. 4.Insert the Red (+) test lead into the voltage/

connector on the meter. The black (-) test lead should be in the COM connector

5.If the component to be measured is mounted on a printed circuit board then disconnect one end of the component to be measured from the circuit.

6.Place the leads of the meter across (in parallel) the component to be measured.

Using a Multimeter: Measuring Voltage

Using the Voltmeter 1.Measures the electromotive force (voltage) between

two points.2. The circuit must be “live.”3. Choose the AC voltage or DC voltage setting on

the meter.4. Insert the Red (+) test lead into the voltage/

connector on the meter. The black (-) test lead should be in the COM connector

5. Place the leads of the meter across (in parallel) the component to be measured.

VV

Using a Multimeter: Measuring Current

Using the Ammeter

1.Measures electron flow (current) in a circuit. 2.The circuit must be “live.”3.Choose the AC amperage or DC amperage setting

on the meter.4.Move the red test lead from the voltage/

connector to the amperage connector on the meter.

5.Break the circuit and place the meter in series with the component to be measured.

A

ENGINEERING NOTATION 1012 109 106 103 100 10‑3 10‑6 10‑9 10‑12

____________________________________________Tera Giga Mega Kilo Base millimicro

nano picoT G M k ohms m μ n p

ampsvoltswattsSLL‑LSR

Quiz Time!!!!