J A Hargreaves
SG Physics
31-Jul-17
INPUT, PROCESS, OUTPUT DEVICES AND THEIR USES
The three parts of any electronic system are
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NPPU
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T
 PPRRO
OCCEES
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TPPU
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Name of
device
Input
Process
Output
Analogue
Digital
Symbol
Energy change
Uses
In CD Player, tannoy,
public address
system, karaoke
machine
washing machine, car
wiper motor, food
processor, vacuum
cleaner
Loudspeaker
output
analogue
electricalsound
Motor
output
analogue
electricalkinetic
Bell
output
digital
electricalsound
door bell, fire bell
Buzzer
output
digital
electricalsound
door warning
Relay
output
digital
electricalkinetic
switching on high
voltage equipment eg
control panels
Solenoid
output
digital
electricalkinetic
central locking, fire
doors
LED
output
both!
electricallight
Lamp
output
both!
electrical
heat & light
7 segment
display
Microphone
output
input
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digital
analogue
analogue- tuner
indicator on radio
digital-on/off power
indicators
analogueatmospheric lighting,
digital-table lamp
electricallight
radio alarm clock
display, video player
display
soundelectrical
tannoy, public
address system,
karaoke machine
J A Hargreaves
SG Physics
Name of
device
Input
Process
Output
Analogue
Digital
Thermocouple
input
analogue
Symbol
31-Jul-17
Energy change
Uses
heatelectrical
kiln thermometer
Solar Cell
input
analogue
lightelectrical
power supply for a
calculator, solar
powered torch
Thermistor
input
analogue
heatelectrical
thermometer for an
aquarium
Light
Dependent
Resistor
Capacitor (&
resistor)
input
analogue
input
analogue
lightelectrical
burglar alarms,
automatic drive
lights
pedestrian crossing
patrols
Potentiometer
input
analogue
volume control in a
stereo, boost control
in a vacuum cleaner
Switch
input
digital
on a table lamp
Transistor
process
digital
no energy change
S
SW
WIIT
TCCH
H
>>00..77VV
AND gate
process
digital
no energy change
various circuits see
e.g. in notes
OR gate
process
digital
no energy change
various circuits see
e.g. in notes
NOT gate
(inverter)
process
digital
no energy change
various circuits see
e.g. in notes
no energy change
to increase the
signal in a radio and
TV
Amplifier
process
analogue
LLD
DRR is short for LLight D
Dependent RResistor- remember it as LLight D
Drops RResistance
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