Lesson Outcomes

After completing this lesson, learners will be able to:

Knowledge

  • Define power supply in a computer system

  • Identify factors affecting system performance

Understanding

  • Explain how power supply impacts hardware components

  • Understand how voltage and system resources affect performance

Application

  • Identify performance issues related to power and hardware

  • Apply basic optimisation techniques to improve system performance

Overview

Power supply and voltage are essential for the operation of all computer systems. Every component in a computer depends on a stable and sufficient power supply to function correctly.

This lesson focuses on:

  • The role of power supply units (PSU)

  • How voltage affects system components

  • Factors that influence computer performance

Understanding these concepts helps IT professionals:

  • Maintain system stability

  • Prevent hardware damage

  • Improve system performance

What is a Power Supply?

Definition

A power supply is:

  • A component that provides electrical power to a computer

  • Converts electricity into usable energy for system components

Role of Power Supply

The power supply:

  • Distributes power to all hardware components

  • Ensures stable voltage levels

  • Protects components from power fluctuations

👉 Without proper power supply, a computer cannot function reliably.

Voltage and System Operation

Voltage refers to:

  • The electrical force that powers components

  • The level of energy supplied to hardware

Effects of Voltage

  • Low voltage

    • System instability

    • Performance issues

  • High voltage

    • Risk of hardware damage

    • Overheating

👉 Stable voltage is essential for safe and efficient operation.

Factors Affecting System Performance

Several hardware-related factors impact performance:

1. Number of Processor Cores

  • More cores allow multiple tasks to run simultaneously

  • Improves multitasking performance

2. Running Applications

  • More applications use more memory

  • Can slow down system performance

3. Graphics Card

  • Affects visual performance

  • Important for graphics-intensive tasks

4. Data Bus Width

  • Determines how much data is transferred at once

  • Larger width improves performance

5. Memory Cache

  • Stores frequently used data

  • Speeds up processing

👉 These factors directly influence system speed and efficiency. 

Importance of Power Management

Proper power management helps to:

  • Protect hardware components

  • Improve system stability

  • Reduce system failures

  • Enhance performance

Key Notes

  • Power supply provides energy to all components

  • Voltage must be stable for proper operation

  • High or low voltage can damage systems

  • Performance depends on CPU, memory, and hardware factors

  • Proper power management improves system reliability

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