Computer Science
Grade 3
20 min
The Speaker: Hearing Sounds
Students learn that speakers allow computers to make sounds.
What you'll learn
- Identify the part of the computer that lets you hear sounds.
- Explain in one sentence how a speaker helps you hear sounds from the computer.
- Point to the speaker on a computer or picture of a computer.
Tutorial Preview
1
Introduction & Learning Objectives
Learning Objectives
Identify the speaker as a computer output device.
Explain that a speaker's job is to turn digital signals into sound waves we can hear.
Describe how an event, like clicking a button, can trigger a sound to play.
Give an example of data that tells a speaker what sound to make, like a music file.
Explain the difference between high and low sounds (pitch).
Explain the difference between loud and soft sounds (volume) and how the computer controls it.
Have you ever wondered how your computer or tablet plays your favorite songs and game sounds? 🎶 Let's discover the magic part that makes all the noise!
Today, we're going to learn about a very important piece of computer hardware: the speaker! We will explore how it takes secret messages, called...
2
Key Concepts & Vocabulary
TermDefinitionExample
SpeakerA hardware part of the computer that takes instructions and turns them into sounds we can hear.The part of your laptop where music comes out, or the separate boxes next to a desktop computer.
Digital SignalA secret code made of 1s and 0s that the computer sends to its parts. For a speaker, this code is the recipe for a sound.A music file like an MP3 is a very long digital signal that tells the speaker how to make a song.
Sound WaveAn invisible vibration or 'wiggle' in the air that our ears catch and hear as sound.When a speaker plays a dog bark, it pushes the air to make a special wiggle that sounds like 'woof!'
EventAn action that the computer notices, which can cause something else to happen.Clicking the 'play' button on a video...
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Core Syntax & Patterns
The Event-to-Sound Rule
WHEN an event happens, THEN the computer can send a sound signal.
This is a cause-and-effect rule. An action (the event) triggers a reaction (playing a sound). Computers follow this rule to know when to make noise.
The Data-to-Wave Rule
The speaker reads a digital signal (data) and turns it into a sound wave.
This rule explains the speaker's main job. It's a translator that changes computer code into real-world sound that our ears understand.
The Volume Conditional Rule
IF the volume number is big, THEN the sound is loud. IF the volume number is small, THEN the sound is soft.
This is a conditional, or an 'if-then' rule. The computer checks the volume number (data) and tells the speaker how big to make the sound waves.
4 more steps in this tutorial
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Challenging
You are programming a game. You want a 'victory fanfare' sound to play, but ONLY IF a player has collected all 3 keys AND has reached the castle door. Which set of rules will work?
A.IF player has 1 key, THEN play sound. IF player has 2 keys, THEN play sound
B.IF player reaches castle door, THEN play sound
C.IF player has 3 keys, THEN play sound
D.IF player has 3 keys AND player is at castle door, THEN play sound
Challenging
A computer stores a dog's bark, a cat's meow, and a person's voice as different patterns of 0s and 1s. How can the exact same speaker produce all these different sounds?
A.The speaker has separate parts for barks, meows, and voices
B.The computer changes the color of the speaker for each sound
C.The speaker can only make one sound, and the computer is tricking you
D.The speaker gets a different set of instructions (the pattern of 0s and 1s) for each sound
Challenging
A big speaker in a movie theater and a tiny headphone speaker both work by making vibrations. Why does the movie theater speaker need to be so much bigger and more powerful?
A.To make the sound travel a much longer distance and fill a large room
B.Because movie theater screens are very bright
C.To keep the speaker from getting cold
D.So that it can play sounds backwards
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Frequently asked questions
What grade level is "The Speaker: Hearing Sounds"?
The Speaker: Hearing Sounds is a Grade 3 Computer Science lesson on ExcelOS.
What will I learn in The Speaker: Hearing Sounds?
You'll be able to: Identify the part of the computer that lets you hear sounds; Explain in one sentence how a speaker helps you hear sounds from the computer; Point to the speaker on a computer or picture of a computer.
Is "The Speaker: Hearing Sounds" free to practice?
Yes. You can read the tutorial preview for free, and signing up for a free ExcelOS account unlocks the full tutorial and all practice questions with instant feedback.
How many practice questions are included with The Speaker: Hearing Sounds?
This lesson includes 27 practice questions across multiple difficulty levels, each with instant feedback and explanations.