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GCSE ICT Unit 1 Revision
Transcript of GCSE ICT Unit 1 Revision
Dual band – picks up two frequencies
Tri band – picks up three frequencies
Quad band – picks up four frequencies
To speak to someone abroad, you need to have a phone that can operate on one or more different frequencies.
Phone Battery Life:
Some activities will use up your battery faster than others. Surfing the Internet will use more battery than sending a text message. If you’re using a smartphone then you can try to conserve energy by closing apps that you don’t use all the time. Applications that run in the background will use your phone’s CPU (central processing unit), wasting battery life. You can also turn down your screen brightness.
The sharpness of images on a phone’s screen will depend on the resolution. Screen resolution is measured in pixels. The higher the number (e.g. 640 × 960) the better the image quality. Mobile Phones SMS (Short Message Service) – to send text messages
Camera – still images and video
Bluetooth – allowing data to be exchanged over short distances between devices
Wi-Fi (Wireless Fidelity) – to exchange data but the signal can travel long distances
Internet – to browse web pages and send messages via webmail
MP3 player – to listen to music files
Touch screen – to make it easier to use
3G – allows the user to access the Internet via a mobile phone network
Games and apps – software for entertainment or practical uses
Predictive text – makes it easier/faster to send SMS messages
GPS (Global Positioning System) – can pinpoint your location via satellites. Personal Computers Types:
Laptop and Notebook - Portable. Good for business users or students.
Netbook - Smaller – for browsing the Internet wirelessly.
Desktop Computer - Heavy – designed to stay in one place Good for an office environment.
Parts of a Computer:
Central Processing Unit - This is the part of the computer that processes calculations. The speed is measured in GHz (Gigahertz).
Hard Drive - This hardware is the main storage. Software and data are stored on the hard drive. Hard drive storage is measured in gigabytes.
Memory - The computer uses memory to run applications - random access memory. This type of memory is temporary.
CD or DVD Drive - This hardware allows you to install applications, listen to music CDs or watch pre-recorded movies on DVD. You can also use it to ‘burn’ data.
USB Ports - Computers have several USB ports that you can plug storage and other devices into (e.g. USB memory stick, web cam, portable hard drive).
Wireless - With wireless you can connect to the Internet or send data without cables. However, the signal may not always be strong enough. A cable offers a stronger connection.
Graphics Card - A good graphics card will allow the system to display high quality images, video or games. Camcorders Takes still images
Some have an LCD viewing panel
Some have GPS built in
Some let you edit images (e.g. crop) using the camera
Most have a zoom feature
Connectivity – download straight to PC
Stores images on a memory card
Compact cameras – very small and lightweight
DSLR cameras – bigger but have more features and settings Cameras Can shoot in normal mode or HD
Optical or Digital zoom
Image stabiliser mode (no shake)
LCD screen – viewfinder or for playback
Own internal hard drive or memory cards
Different modes, e.g. night
Connectivity – download straight to PC
Lightweight and portable
Can take still images
GPS tagging (shows the location of video) GCSE ICT Unit 1 Revision DVD Player - Plays DVD discs. Most DVD players have to be connected to a TV. Some are smaller, portable devices which have an LCD screen and speakers. Portable DVD players can be used when travelling.
Blu-Ray Disc - Bigger storage capacity than a DVD disc. Was invented to allow the recording, rewriting and playback of high-definition video (HD). Offers more than five times the storage capacity of traditional DVDs.
Home Theatre PC - High spec PC with Media Centre software. Lots of storage for video and music files.
HDTV - High Definition TV. Clear pictures with vivid colours and up to five times more detail than standard definition. More and more programmes are being made in HD. Most new flat-screen televisions (LCD and plasma) are able to show HD programmes. Personal Digital Devices Home Entertainment These devices are used to help guide people to a destination using GPS technology. They display map information on a small screen and can receive and display real-time traffic information. Systems can be connected to a PC to update the street-mapping software (if roads change). Portable Media Players MP3 players and IPods are digital audio players. However, mobile phones, tablet PCs and even camcorders now fall into this category. They allow you to:
Listen to a large volume of music files
Record and watch video footage
Send messages over the Internet
Interact with other users (e.g. VoIP)
Use Cloud storage Navigation Aids (Sat Navs) 1.7 Mobile Phones Personal Computers Cameras and Camcorders Home Entertainment Portable Media Players Navigation Aids Made By Matthew Sochor More Information: 1.2 With computers there are peripherals, they can be plugged in or linked wirelessly. There are 3 types of peripherals:
Input devices - allows the user to enter data into the computer eg. keyboard
Output devices - allows the user to view, hear or print the processed data eg. printer
Storage devices - allows the user to store data so it can be used again eg. external hard drive
When buying a new computer always look at these key parts of the specification: battery life, RAM, storage, processor speed. If you choose a higher specification then you won’t need to upgrade your computer as quickly (Future Proofing). Note: Unit 1 1.4 is games consoles, but it is not mentioned. 1.1 Mobile phones have many different functions most of them also have secondary storage which is SD and SDHC cards. Also battery life will be affected by different applictaions. Finally the higher the number of pixels the better the image quality.
1.2 There are 3 types of personal computers, each are different and have different purposes. They are also sevral parts of computers each doing a different job. Additonally there are three different types of peripherals: input, output and storage.
1.3 Cameras have roughly the same fucntions as camcorders but there are two different types of cameras: compact cameras and DSLR cameras.
1.5 There are different types of home entertainment: DVD Player, Blu-Ray Disc, Home Theatre PC and HDTV - High Definition TV.
1.6 Portable media players such as MP3 player, iPods, mobile phones, tablet PCs and even camcorders have different functions.
1.7 Sat Navs help people get to a destination using GPS. Cameras and Camcorders