Session Overview
Welcome to Session 2!
In this session, we'll explore what makes computers work - from the physical parts (hardware) to the programs that run on them (software). We'll also learn about operating systems and how to create simple programs!
Learning Objectives
- Identify the key components of a computer
- Understand the difference between hardware and software
- Learn about different operating systems
- Discover how data is stored using binary
- Write simple math programs in Python
Introduction (10 minutes)
Review from Session 1 and introduce today's topics
Computer Hardware (35 minutes)
Learn about CPU, memory, storage, and other components
Break (10 minutes)
Time to stretch and ask questions
Operating Systems & Software (25 minutes)
Explore different operating systems and how software works
Simple Math Programs (30 minutes)
Create Python programs for basic calculations
Wrap-up and Preview (10 minutes)
Review what we've learned and preview Session 3
Activities
Computer Hardware
The Main Parts of a Computer
Computers have several important parts that work together:
- CPU (Central Processing Unit) - The "brain" that performs calculations and executes instructions
- RAM (Random Access Memory) - Temporarily stores data that programs are currently using
- Storage - Hard drives or SSDs that permanently store your files and programs
- Motherboard - The main circuit board that connects all parts together
- Input Devices - Keyboards, mice, touchscreens, etc.
- Output Devices - Monitors, speakers, printers, etc.
The Hardware Component Gallery
CPU
The brain of the computer that performs calculations and executes instructions.
RAM
Temporarily stores data that programs are currently using.
Hard Drive
Permanently stores your files and programs.
Motherboard
The main circuit board that connects all components together.
Graphics Card
Creates the images you see on your monitor.
Power Supply
Provides electricity to all components.
Activity: Label the Computer Parts
Can you identify all the main components inside a computer?
Start Computer Parts ActivityOperating Systems & Software
What is an Operating System?
An operating system (OS) is the main software that manages your computer. It controls the hardware, runs other software, and provides a user interface.
The operating system is like a translator between you, your apps, and the computer hardware. Without it, your computer would just be a collection of parts that can't do anything!
Common Operating Systems
Windows
Made by Microsoft
Used on most PCs
Great for gaming and business
macOS
Made by Apple
Used on Mac computers
Popular for creative work
Linux
Open source (free)
Many different versions
Used by programmers and servers
Software vs. Hardware
| Hardware | Software |
|---|---|
| Physical parts you can touch | Programs and code you can't touch |
| Examples: CPU, keyboard, screen | Examples: Games, web browsers, word processors |
| Wears out over time | Can be updated and improved |
| Usually expensive to replace | Can be installed multiple times |
Activity: Operating System Explorer
Let's explore features of different operating systems!
Explore All ActivitiesBinary Numbers
How Computers Store Data
Computers don't understand letters, numbers, or pictures the way we do. At their most basic level, computers only understand two states: ON or OFF, also represented as 1 or 0.
These 1s and 0s are called binary digits or bits. They're the building blocks of all computer data.
With enough bits put together, computers can represent anything - text, images, videos, sounds, and more!
Binary Counting
We count using 10 digits (0-9), called the decimal system. But computers count using just 2 digits (0-1), called the binary system.
| Decimal (Base 10) | Binary (Base 2) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 10 |
| 3 | 11 |
| 4 | 100 |
| 5 | 101 |
| 6 | 110 |
| 7 | 111 |
| 8 | 1000 |
Activity: Binary Challenge
Click the binary digits (0 or 1) to create different numbers. Can you make the binary number for 15?
Decimal value: 0
Binary Fun Facts:
- A single binary digit (0 or 1) is called a "bit"
- Eight bits together make a "byte"
- A byte can represent numbers from 0 to 255
- Text, images, videos, and all computer data are stored as binary
- A kilobyte (KB) is about 1,000 bytes
- A megabyte (MB) is about 1,000,000 bytes
- A gigabyte (GB) is about 1,000,000,000 bytes
Math Programs with Python
Programming with Python
Python is a popular programming language that's easy to read and write. It's a great first language for beginners!
In Python, you can write instructions for the computer to follow. These instructions can do many things, like perform calculations, create games, or analyze data.
Today, we'll use Python to create simple math programs.
Your First Python Program
# This is a simple Python program that adds two numbers
a = 5
b = 3
sum = a + b
print("The sum of", a, "and", b, "is", sum)
Let's Try More Math Operations
# Python can do all kinds of math operations a = 10 b = 2 # Addition print(a, "+", b, "=", a + b) # Subtraction print(a, "-", b, "=", a - b) # Multiplication print(a, "*", b, "=", a * b) # Division print(a, "/", b, "=", a / b) # Exponentiation (a to the power of b) print(a, "^", b, "=", a ** b)
Making an Interactive Calculator
# This program asks the user for input
print("Welcome to the Simple Calculator!")
# Get input from the user
num1 = int(input("Enter the first number: "))
num2 = int(input("Enter the second number: "))
# Perform calculations
sum = num1 + num2
difference = num1 - num2
product = num1 * num2
quotient = num1 / num2
# Show results
print("Sum:", sum)
print("Difference:", difference)
print("Product:", product)
print("Quotient:", quotient)
Activity: Create Your Own Math Program
Now it's your turn to write a Python program that can:
- Ask the user for their age
- Calculate how old they'll be in 10 years
- Calculate how many days old they are (approximately)
- Display the results
Resources
Additional Learning Materials
Code.org
Computer Science Fundamentals
Scratch
Block-based coding for beginners
Python Tutorial
Learn Python step-by-step
Hour of Code
Fun coding activities for beginners
