The Device – JSS1 Computer Studies Lesson Note (Third Term)

A device is a tool or machine that is made to do a specific job. Devices are all around us and help us in our daily lives. They can be simple or complex. Some devices need electricity to work, while others do not. Devices are designed to make our work easier, faster and better.

Behavioural objectives

By the end of the lesson, students should be able to:

• explain what a device is;
• name the four types of devices and give examples of each;
• list the five basic parts of a device;
• explain how devices change one form of energy into another, with examples;
• state how devices help us at home, at school, at work and in transportation;
• list ways of taking care of devices.

What are the types of devices?

Electronic devices

Electronic devices use electricity to work. They have parts inside that control how electricity flows to make the device do its job. Some examples are:

• Computers: Machines that can process data, run programs and connect to the internet
• Smartphones: Small computers that can make calls, send messages, take pictures and run apps
• Televisions: Show pictures and play sounds from broadcasts, cables or the internet
• Radios: Play sounds and music from radio waves
• Calculators: Help solve maths problems quickly
• Digital cameras: Take pictures and store them as digital files

Mechanical devices

Mechanical devices use moving parts to work. They may use simple machines like levers, wheels or gears. Some examples are:

• Bicycles: Use wheels, chains and gears to move people
• Clocks: Use gears and springs to tell time
• Can openers: Use a turning wheel to cut open cans
• Door knobs: Use a turning motion to open and close doors
• Pencil sharpeners: Use a turning blade to make pencils sharp

Medical devices

Medical devices help doctors and nurses take care of sick people. Some examples are:

• Thermometers: Measure body temperature
• Blood pressure monitors: Check how hard the heart is pumping blood
• Stethoscopes: Let doctors hear sounds inside the body
• X-ray machines: Take pictures of bones inside the body
• Hearing aids: Help people hear better

Communication devices

Communication devices help people talk to each other, especially when they are far apart. Some examples are:

• Telephones: Let people talk to each other from different places
• Walkie-talkies: Small radios that let people talk to each other nearby
• Modems: Connect computers to the internet
• Satellite dishes: Send and receive signals from space

What are the parts of a device?

Most devices have these basic parts:

1. Input: The part where you put in information or energy
2. Processor: The part that does the main work of the device
3. Output: The part that shows the result or does the final job
4. Power source: Where the device gets energy (batteries, electricity or human power)
5. Controls: Buttons, switches or screens that let you tell the device what to do

How do devices work?

Devices work by changing one form of energy into another. For example:

• A light bulb changes electrical energy into light energy
• A speaker changes electrical energy into sound energy
• A motor changes electrical energy into movement energy
• A solar panel changes light energy into electrical energy

Why are devices important in our lives?

At home

Devices make our homes comfortable and life easier. They help us:

• Cook food (stoves, microwaves, blenders)
• Clean (vacuum cleaners, washing machines)
• Stay comfortable (fans, air conditioners, heaters)
• Have fun (TVs, video games, music players)

At school

Devices help teachers teach and students learn. They include:

• Computers for research and writing
• Projectors to show information to the whole class
• Calculators to solve maths problems
• Tablets for interactive learning

At work

Devices help people do their jobs better and faster:

• Office workers use computers, printers and phones
• Factory workers use machines to make things
• Farmers use tractors and watering systems
• Doctors use special tools to help sick people

For transportation

Devices help us move from place to place:

• Cars, buses and trains carry people on land
• Aeroplanes and helicopters carry people through the air
• Ships and boats carry people on water
• GPS devices help us find our way

How do we take care of devices?

To keep devices working well, we need to:

1. Keep them clean: Dust and dirt can make devices break
2. Use them correctly: Follow the instructions that come with the device
3. Store them properly: Keep devices in safe places when not in use
4. Charge batteries: Make sure battery-powered devices have enough power
5. Update software: For electronic devices, keep the programs up to date
6. Fix problems early: If something seems wrong, get help before it gets worse

What will devices be like in the future?

Devices are always getting better. In the future, we might see:

• Smaller devices that can do more things
• Smarter devices that can learn what we like
• Connected devices that talk to each other
• Helpful robots that can do chores and help people
• Medical devices that can find and fix health problems early
• Energy-saving devices that use less power and help the planet

People who know how to use devices well will have many chances to do good things in the world. Devices are tools to help us. How we use them to solve problems and help each other is still what matters most.

Evaluation

1. What is a device?
2. Name the four types of devices and give one example of each.
3. List the five basic parts of a device.
4. State the energy change that happens in a light bulb and in a solar panel.
5. State three ways of taking care of devices.

Assignment

1. List three devices found at home and three devices found at school.
2. For each device, state the job it does and whether it is electronic or mechanical.