Desktop, laptop, smart phone, tablet
Monday, March 20, 2023 8:38 AM
Personal computer (PCs)
○ Common in homes and offices
○ Come in different shapes and sizes (such as desktops and laptops)
Feature(performance(processor, memory, etc), size, price, connection, based on requirements (work,
study), expansion, media support, security, easy to use or not, functions
Desktops
• More space for components than laptop
• Provide users with the option to upgrade
• Usually needs to have peripheral devices connected to it
Devices Desktop Laptop Smartphone Tablet
Use home/office home/office Almost everywhere, School, home, arts work,
home, work, school
Characteristics Fixed in one place Not fixed (a portable Not fixed (a portable Not fixed (a portable device)
-need peripheral device) device) -can use with hands or touch
connected -do not need -can use with hands to pens to move through it
-no battery peripheral connected move through it -a rechargeable battery
to it -a rechargeable battery
-a rechargeable
battery
Features -Higher performance -High performance but -Poor performance -Moderate performance
(CPU, RAM) less than desktop -Poor graphics (but high -Moderate graphics (but high
-Better graphics -Low graphics than graphics in high model graphics in high model tablets)
-Separate monitor Desktop phones) -have only one screen
-Attached monitor with -have only one screen
keyboard, a track pad,
etc.
Storage & Have more space Have less space than Have low space Have low space compared to
upgrade (expansion slots, USB desktop compared to desktop and desktop and laptop but more
ports) -less spare parts laptop space than smartphone
-can upgrade easily, -few spare parts
more spare parts
Connectivity HDMI, USB, VGA, Earphone, charger, Earphone, charger, Earphone, charger, Bluetooth,
Display port, serial USB, HDMI cable Bluetooth, HDMI HDMI
port
Network wire/cable (Ethernet) Wifi, hotspot, etc. Wifi, mobile data, Wifi, mobile data, hotspot, etc.
hotspot, etc.
Fixed or not? Fixed – not easy to Not fixed -but not easy Not fixed –very easy to Not fixed – easy to lose
lose to lose lose
Media support Can connect to a Can connect to a few Can connect to a few Can connect to a few devices
variety of devices devices(TV, computer devices with Bluetooth or with Bluetooth or HDMI (such
(CD, DVD player, etc) screen, etc) HDMI (such as TV screen as TV screen or PC)
or PC)
Portable? No (because of its big Yes (because of its Yes (because of its small Yes (because of its size, weight
size, weight and moderate size, weight size, lightweight and no and no attached devices)
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connected devices) and attached attached devices)
keyboard and track
pad)
Easy to use? No (a little difficult) Yes Yes (too easy to use Yes
because we can use its
features with our own
hands to move or smth
else)
Energy Higher energy use an average of 60 Low energy consumption Low energy consumption but
consumption consumption to 200 watts of -use less power higher than smartphones
electricity (high) (less
than desktop but more
energy consumption
than phones)
Sensors in smartphone
1. Accelerometer
2. Magnetometer
3. GPS
4. Biometric sensors
5. Barometer
6. The proximity sensor
7. The ambient light sensor
8. (Gyroscope-mainly used in altimeters inside
aircraft)
1. Accelerometers
• handle axis-based motion sensing and can be found in fitness
trackers as well as phones
• also tell the phone’s software which way the handset is pointing
• accelerometers measure acceleration
• show your current speed in a driving app
• This sensor is itself made up of other sensors, including
microscopic crystal structures.
(The accelerometer interprets the voltage coming from the crystals to
figure out how fast your phone is moving and which direction it’s
pointing in.)
2. Magnetometer
• it measures magnetic fields
• can thus tell you which way is north by varying its voltage output to
the phone
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• it measures magnetic fields
• can thus tell you which way is north by varying its voltage output to
the phone
• they can detect magnetic metals
3. GPS(Global Positioning System)
• GPS units inside phones get a ping from a satellite up in space to
figure out which part of the planet you’re standing on.
• it connects with multiple satellites then calculates where you are based
on the angles of intersection.
• If no satellites can be found—you’re indoors or the cloud cover is
heavy—then you won’t be able to get a lock.
• GPS doesn’t use up any of our phone’s data.
4. Biometric sensors
• a fingerprint sensor or a facial recognition system to help us log into
our phone
• These biometric sensors are generally more secure and more
convenient (than using a PIN code or a pattern alone)
• Fingerprint sensors have made the move from hardware buttons to in-
screen circuitry.
• There are three main types:
1. Optical (scanning with light),
2. capacitive (scanning with electronic capacitors), and
3. ultrasonic (scanning with sound waves).
In facial recognition,
1. using a normal camera lens and trying to verify your identity with
a high-resolution photo (or)
2. an infrared sensor maps your face in three dimensions using dots,
which are then interpreted by software on the phone
5. Barometer
• measures air pressure
• it’s useful for everything from detecting weather changes to
calculating the altitude you’re at.
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6. The proximity sensor
• usually sits up near the top speaker
• combines an infrared LED and light detector to work out when you
have the phone up to your ear, so that screen can be switched off
• emits a beam of light that gets bounced back, though it’s invisible to
the human eye
7. The ambient light sensor
It takes a measuring of the light in the room and adjust your screen’s
brightness accordingly (if indeed it’s set to auto-adjust)
Features and functions of smartphones
1. Make a ph call (SIM card)
2. Send text message (SIM card)
3. Internet browsing
• Social networking
• Finding information/search engine
• Send email/video call
4. Take photo & video (camera)
5. Editing photos & drawing
6. Play games
7. Create documents
8. Play music & movie(media player)
9. Use as alarm and clock
10. Calendar and planner
11. GPS (find location/track, weather condition)
12. Flashlight
13. Compass
14. Fitness tracker
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15. Ebook reader
16. Calculator
17. Translator/dictionary
18. Recorder(audio)
Phones are Multifunctional devices which can do a range of functions.
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