Systems Components flashcards

Cell

Battery/ SC power supply

Variable DC power supply

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Purpose of Variable DC power supply

Easily adjust the output voltage and somtimes the current

AC power supply

Purpose of AC power supply

Supplies alternating currant to an electronic device

Resistor

Purpose of a resistor

Limits or regulates the flow of electrical current in an electronic circuit

variable resistor,

potentiometer,

voltage divide

Purpose of a potentiometer

Measure the unknown voltage by comparing it with a known voltage

Purpose of a voltage divider

Scale down very high voltages so that it can be measured by a volt meter

variable resistor

Purpose of a variable resistor

Adjust the value of current or voltage

light-dependent resistor (LDR)

Purpose of a Light dependent resistor

Indicate the presence or absence of light, or to measure the lights intensity

filament globe

Thermistor

Purpose of the thermistor

Changed resistance as temperature changes

Fuse

Purpose of a fuse

Melts with too much current flows through, protects the circuit from too much current

(non-polarised) capacitor

Pass AC and block DC IN A SERIES CIRCUITA, filters power supplies

variable capacitor

Purpose of a variable capacitor

To allows for change in capacitance, set a resonance frequency

polarised capacitor,

electrolytic capacitor

Filter power supplies

iron-cored transformer

(one secondary winding)

iron-cored transformer

(one secondary winding –

centre-tapped)

iron-cored transformer

(two secondary windings)

Purpose of Transformer

Transfer electric energy from one alternating current circuit to one or more other circuits, either increasing (stepping up) or reducing (stepping down) the voltage

junction diode

Purpose of junction diode

also known as a PN junction it allows current to flow more easily in one direction than another

Zener diode

Purpose of a Zener diode

Voltage references or to regulate the voltage across small circuits

photo diode

Purpose of a photo diode

The exact measurements of the intensity of light in science and industry, faster and more complex than normal PN junction diodes

light-emitting diode (LED)

diode bridge

purpose of a diode bridge

Rectifying an alternating current into a direct current or pulsating current

npn transistor

Purpose of NPN transistor

Amplifies weak signals that enter into the base and produces strong signals at the collectors end

pnp transistor

Increase voltage or current of signals, can be used as a switch

What is the difference between PNP and NPN transistor

PNP have a lower turn on voltage NPN have higher current carrying capacity

n-type junction field effect transistor (NJFET)

purpose of n-type junction field effect transistor (NJFET)

Switches and Amplifiers

p-type junction field effect transistor (PJFET)

Purpose of p-type junction field effect transistor (PJFET)

Switches and Amplifies 2

integrated circuit (IC)

What kinds of Integrated circuits are there

Amplifier, timer, counter, logic gates, computer memory, micro controller and processor

single pole, single throw (SPST) switch

Purpose of single pole, single throw (SPST) switch

Basic ON/OFF function

single pole, double throw (SPDT) switch

Purpose of single pole, double throw (SPDT) switch

Connects a single line conductor to either of 2 possibilities

double pole, single throw (DPST) switch

Purpose of double pole, single throw (DPST) switch

Connect 2 source terminals to their respective output terminals (NEVER TO EACH OTHER)

double pole, double throw (DPDT) switch

Purpose of double pole, double throw (DPDT) switch

Connect 2 independent signals to two possibilites in tandem

normally open

(NO) switch

Purpose of a normally open switch

Allows no current to flow unless altered

normally closed (NC) switch

Purpose of normally closed switch

Allows current to flow until altered

Relay

Purpose of a relay

Control one circuit by opening and closing contacts in another circuit

Ammeter

Purpose of ammeter

Measure amps (current)

Voltmeter

Purpose of voltmeter

Measure volts

Galvanometer

Purpose of a Gavanometer

Measure the direction and intensity of electrical current

cathode ray oscilloscope (CRO)

Purpose of a cathode ray oscilloscope (CRO)

Displaying measuring and analyzing waveforms (DC or AC) and other electrical phenomena

voltage amplifier

Purpose of a voltage amplifier

Accept input voltage and produce an accurate replica of this voltage as an output voltage

operational amplifier (op amp)

Purpose of a operational amplifier (op amp)

Amplify and output the voltage difference between two input pins

Motor

Microphone

Loudspeaker

NOT gate or inverter

Purpose of a NOT gate

Inverts the input signal eg. 1 = 0

OR gate

Purpose of an OR gate

Will produce an on signal is at least one pin is on

XOR (exclusive OR) Gate

The inputs must be different to produce an ON signal

NOR Gate

If at least one pin is ON it will produce an OFF signal

AND Gate

A ON signal will only be produced is both of the pins are ON

NAND Gate

A OFF signal will only be produced if both pins are ON

T (toggle) flip-flop

Purpose of a T (toggle) flip-flop

Changes or toggles its output based in the input state

Earth

Aerial

What is an Aerial

Antenna

non-connected leads

connected leads

dot for junction of connected leads

Watts =

volts X Amps

What is a analogue signal

It is a continuous signal with constant fluctuations

What is a digital signal

A signal with only two voltages 1 and 0, which is high and low respectively

What does variable mean

A factor or condition which can be measured, altered or controlled

What type of motion is used in resonance

oscillation

what is the difference between Non and polarized capacitors

Capacity how much voltage they can store, Non-Polarized capacitors can run much higher frequencies

What is resonance

A phenomenon that occurs when objects match the vibrations of another object increases the amplitude of an objects oscillations

What are the 4 forces

Compression, Tension, Shear, Torsion, bending