S3 Computer Systems Unit 2 KC 3

Describe how a computer system uses energy.

• A computer system uses energy to power its components such as the CPU, monitor, and other peripherals, enabling it to process data and perform tasks.

• A computer system uses energy only to store data and does not require energy for processing.

• A computer system uses energy solely for cooling purposes and not for running its components.

• A computer system uses energy to display images but not to process information.

Identify methods to reduce the amount of energy used by computer systems.

• Methods to reduce energy use include turning off devices when not in use, using energy-efficient hardware, enabling power-saving modes, and reducing screen brightness.

• Increasing screen brightness and running multiple programs at once.

• Using outdated hardware and disabling power-saving features.

• Leaving devices on overnight and avoiding software updates.

One way to reduce energy use on monitors is to dim or turn off the display if not in use after ________.

• set time

• battery is full

• monitor is unplugged

• screen is cleaned

To save energy, you should reduce ________ and backlighting on monitors during the day.

• brightness

• contrast

• volume

• resolution

You should avoid the use of ________ on energy efficient monitors to reduce energy use.

• screensaver

• wallpaper

• brightness

• speaker

A firewall is:

• A device or software that monitors and controls incoming and outgoing network traffic based on predetermined security rules.

• A type of computer virus that infects files.

• A tool used to increase internet speed.

• A programming language for web development.

Encryption is:

• A process of converting information into a code to prevent unauthorized access.

• A method of deleting files permanently.

• A way to increase internet speed.

• A technique for compressing data.

Public and private keys are used in encryption to:

• Encrypt and decrypt messages securely

• Store passwords

• Generate random numbers

• Compress files

What is a firewall? A firewall is a system designed to prevent ________ access to or from a private network such as a school.

• unauthorised

• authorised

• physical

• remote

What does a firewall prevent?

• Authorised access to the network from outside users

• Unauthorised access to the network from outside users

• All access to the network

• Only internet access