1. Tech level 3 cyber security
2e, 2f, 2g

2. Learning Objectives All learners will have the opportunity to:
understand and explain the role of:
pipelines
multi-core processors
the registers found in a computer including the accumulator
understand the difference between alternating current(AC) and direct current(DC)
describe the internal and external power supply units which convert AC to DC current
compare and contrast external power supply units
define computer cooling devices.

3. Assessment outcomes 2d – The Internal components of a computer
2e – Internal and external Power Supply Units (PSUs) which convert power from Alternating Current to Direct Current
2f – Cooling Devices and their purpose

4. Pre-Reading Discussion
The concept of parallel processing and pipelines in computers
The purpose of pipelines in computers
Registers in computers:
CPU Registers
Special Registers
The accumulator
The reasons for cooling computers
Different methods of cooling computers

5. Power Supplies: AC v DC
Current is the flow of ‘electrons’ – It is measures by amplitude.
AC (Alternating current) describes the flow of charge that changes direction periodically. As a result, the voltage level also reverses along with the current. AC is used to deliver power to houses, office buildings, etc.
DC (direct current) is the unidirectional flow or movement of electric charge carriers (which are usually electrons). The intensity of the current can vary with time, but the general direction of movement stays the same at all times. 

6. Power Supplies: AC v DC
AC (Alternating Current)
DC (Direct Current)

7. Computer Power Supplies: AC to DC conversion
Computers represent everything with bits, and ordinarily this means one voltage range for a 0 and another voltage range for a 1. Therefore an ‘alternating current’ that cannot guarantee delivering set voltage ranges is not useful:
“Digital devices deal with logic levels, you need a steady (DC) voltage to represent a 1 and another steady voltage to represent a 0. Power is used each time a level changes AC is constantly changing, and is defined by a peak voltage and a frequency, so a single voltage reading is meaningless. For example a house outlet could be 140V one time then –30V, etc (120V outlet swings between –170V and 170V)” DC-power

8. Different types of Power Supply
AC – to – DC Supply:
AT Power Supply
ATX Power Supple
ATX – 2 Power Supply
Uninterruptable Power Supple
Task:
Find out what the 3 AC-DC PSU’s are used for.
Find out what a UPS is used for.

9. Different Types of power supply resources
How to pick the best PC power supply
pcworld.com/article/ /how-to- pick-the-best-pc-power-supply.html
Types of PC Power Supply
ehow.com/about_ _types-pc- power-supply.html
What is a power supply and what does it do?
helpwithpcs.com/hardware/power- supply-basics-inc-pinouts.php

10. Graded Exercises
Complete the graded exercises for today’s lesson. (Lesson 3 Folder)
Everyone should complete the grade D questions.
If you have answered a question in your notes circle the section and write the question above it in a different coloured pen.

11. Pre-Reading for lesson 4
Make pre-reading notes on the following topics:
Resources
The purpose of memory in computer systems
Different types of Internal Hard Drive:
SSD
Magnetic Disk
SATA
PCIe
How Internal Hard Drives work
Different types of memory and chips:
RAM
DRAM
SRAM
ROM
PROM
EPROM
EEPROM
See URLs in Lesson 4 Folder