💻 TechnologyGrade 2Lesson 1
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Parts of a Computer: Monitor, Keyboard, Mouse, and CPU

How to use: Download the PDF to print the worksheet. Then use this page to repeat activities and check answers.

Learning Objectives

  • 1Name the main parts of a computer — monitor, keyboard, mouse, and CPU
  • 2Describe what each one does
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Mini Lesson

A computer is a machine that helps us write, draw, watch, learn, and communicate. But a computer is not just one thing — it is made of several parts, and each part has a special job!

The monitor

  • The monitor is the screen that shows you everything the computer is doing.
  • It is an output device — it gives information OUT to you.
  • Example: When you type a letter, it appears on the monitor screen.

The keyboard

  • The keyboard has rows of keys with letters, numbers, and symbols.
  • You press the keys to type words and give instructions to the computer.
  • It is an input device — you put information IN to the computer.

The mouse

  • The mouse is a small handheld device that controls a pointer on the screen.
  • You move it to point at things, and click its buttons to select or open them.
  • Like the keyboard, it is an input device.

The CPU — the brain of the computer

  • CPU stands for Central Processing Unit.
  • It is the part inside the computer (often inside the tower or the screen) that processes all instructions and runs every program.
  • Think of the CPU as the computer’s brain — nothing works without it.

Other parts you may see

  • Speakers — output sound and music.
  • Printer — outputs text and images onto paper.
  • Storage — saves files and programs (hard drive or USB).
Parts of a ComputerA labeled desktop computer showing the monitor, CPU tower, keyboard, mouse, and speaker, each with an arrow and label.MonitorCPUKeyboardMouseSpeaker
A labeled desktop computer setup showing the monitor, CPU tower, keyboard, mouse, and speaker.
Input and Output DevicesTwo columns showing input devices on the left — keyboard and mouse — and output devices on the right — monitor and speaker — with a CPU in the center connecting them.Input to CPU to OutputINPUTKeyboardYou type INMouseYou click INCPUbrainOUTPUTMonitorShows OUTSpeakerPlays OUTYou put IN, CPU thinks, result comes OUT.
Input devices (keyboard and mouse) send data to the CPU, which sends results to output devices (monitor and speaker).
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Ask yourself: "If I look at the computer in front of me, can I point to the monitor, the keyboard, the mouse, and the CPU?"

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Guided Practice

Sketch your computer diagram from the paper worksheet. Then use the Tracing Pad to practice the key words from this lesson.

Tracing Pad

Tip: After writing each part name, draw a quick arrow from the word to its location on your diagram — labeling diagrams is a key tech skill!

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Exercises

Tap a computer part on the left, then tap what it does on the right.

1. What does the monitor do?

2. What is a keyboard used for?

3. What does CPU stand for?

4. What does the mouse control?

5. Which of the following is an input device?

6. Which of the following is an output device?

7. Why is the CPU called the brain of the computer?

8. What is computer hardware?

9. What does the computer speaker do?

10. What is a computer?

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Assessment

Parent / Teacher Checklist

Lesson 2 →