Definition and classes of Devices

DEFINITION OF A DEVICE

Devices are instruments, equipment or machines made to perform specific functions.

CLASS OF DEVICES

Devices can be classified into four types:

• Early counting devices
• Mechanical devices
• Electrical device
• Electronic device
• Analogue device

EVALUATION

1. What is a device?
2. List the five classes of device.

1. Early counting devices: Examples of this include stones,pebbles,beads,fingers and toes,sticks,grains,marks on the wall etc.
2. Mechanical devices: mechanism consisting of a device that works on mechanical principles. Examples of this include ship, cart, sewing machine, motorcycle, car, typewriter, wheel barrow, Abacus, Slide rule, Napier bone, Pascaline, Jacquard’s loom, Babbage’s analytic engine
3. Electrical devices:  take the energy of electric current and transform it in simple ways into some other form of energy  Examples include electric iron, electric kettle, blender, mixer, electric clipper, fridge, fan, washing machine, grinding machine etc
4. Electronic devices: are components for controlling the flow of electrical currents for the purpose of information processing and system control. Examples include photocopier, scoreboard, calculator, radio, camera, television, telephone and computer.
5. Anologue: They are used to measure things that change from time to time. Examples include: barometer, thermometer, weighing scale, rainguage etc.

GENERAL EVALUATION

1. What is a device?
2. List the five classes of device.
3. State the examples of devices. 

READING ASSIGNMENT

Computer studies Stella Chiemeke   Book 1 page 41.

Modern computer studies by Victoria Dinehin page 21

WEEKEND ASSIGNMENT

1. ____ is an equipment used to perform specific function. (a) Devices  (b) Computer (c) Analog (d) mechanical
2. Devices can be classified into ____ (a) 3 (b) 4 (c) 5 (d) 2
3. Which of these is not early counting devices? (a ) fingers  (b) sticks   (c ) Calculator (d) pebbles
4. Abacus is an example of ____ devices (a) Mechanical (b) Electrical (c) Computer  (d) electrical
5. ____ is an example of electronic device (a ) Abacus (b) Computer  (c ) Fan (d) ship

THEORY

1. What is a device?
2. List the five types of devices with examples.