問72
頻出度★☆☆
IoT デバイスと IoT サーバで構成され, IoT デバイスが計測した外気温を IoT サーバへ送り, IoT サーバからの指示で窓を開閉するシステムがある。このシステムの IoT デバイスに搭載されて, 窓を開閉する役割をもつものはどれか。
令和3年度 ITパスポート試験 問72
テクノロジ系コンピュータ構成要素 › 入出力デバイス
This question's explanation and your answers so far.
解説
問 72
- ア
正解 An actuator is an output device that receives an electrical control signal from a computer and, via a motor, valve, or the like, converts it into physical motion (movement or force). In this system, the IoT device receives the instruction to open or close the window from the IoT server, and with that signal the actuator actually moves the window. The role of acting on (driving) the physical world is carried out by the actuator, so ア is correct.
Incorrectイ
Edge computing is a distributed-processing concept (architecture) in which computation is performed on or near the device rather than sending data to the cloud; it is not a component that physically moves a window. It is a processing-method concept, not an output device, so it is wrong.
Incorrectウ
Carrier aggregation is a mobile-communication technology that bundles multiple frequency bands (carriers) to improve communication speed and bandwidth; it is merely a mechanism for speeding up communication. It has nothing to do with the physical action of opening and closing a window, so it is wrong.
Incorrectエ
A sensor is an input device that detects physical quantities such as temperature, light, or pressure and converts them into electrical signals. In this system it is the component that measures the outdoor temperature, and it does not play the role of moving the window. This choice confuses input (measurement) with output (driving), so it is wrong.
ここがポイント
- Actuator = an output device that converts a control signal into physical motion (movement or force); sensor = an input device that converts a physical quantity into an electrical signal. In IoT the two work as a pair: the sensor measures and the actuator moves.
- Note that the options edge computing (a distributed-processing method) and carrier aggregation (a communication-speedup technology) are not components or devices; the kind of role they play does not match what the question asks.
用語