Input And Output Devices
Overview
A computer is useless on its own: it needs a way to take data in and a way to give results out. Tap a screen, scan a barcode, speak into a microphone, and a stream of data flows into the machine; the processed result then comes back out through a screen, a printer or a speaker. This lesson is about those two halves of the conversation between you and the computer.
You will learn what input and output devices are and why each is needed, meet a wide range of common examples, and then go deeper into sensors, a special kind of input device that captures data from the physical world. By the end you should be able to choose the most suitable device, and the most suitable sensor, for any given situation and explain your choice.
Objectives
- 1 Understand what is meant by an input device and why it is required
- 2 Understand what is meant by an output device and why it is required
- 3 (a) Understand what is meant by a sensor and the purposes of sensors (b) Identify the type of data captured by each sensor and understand when each sensor would be used, including selecting the most suitable sensor for a given context
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Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Input And Output Devices. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- Which of these is an output device? A. microphone B. barcode scanner C. actuator D. keyboard Answer: C
- Which sensor is most suitable for detecting a build-up of carbon monoxide in a home? A. light sensor B. gas sensor C. moisture sensor D. pH sensor Answer: B
- A sensor captures data from its environment in which form? A. digital B. binary C. analogue D. hexadecimal Answer: C
- Which device would be most suitable for entering the price of a product at a supermarket till? A. speaker B. barcode scanner C. projector D. actuator Answer: B
- Which of the following is NOT an input device? A. optical mouse B. digital camera C. laser printer D. touch screen Answer: C
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