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Sensors

  • Sensors function as input devices.
  • They gauge physical attributes of their surroundings, such as light levels, temperature, or motion.
  • Sensors find utility in both monitoring systems and control systems.
    • Monitoring systems oversee the state of a system, collect data, and may issue warning messages.
    • Control systems regulate the system based on sensor inputs.
    • For instance, in a fish tank, if the water temperature dips below an acceptable level, a control system would activate a heater. Subsequently, the system continues monitoring water temperature, deactivating the heater once it falls within the acceptable range.
      • This cyclical process, where outputs influence subsequent sets of input values received from sensors, is termed a feedback loop.

Sensors | Computer for GCSE/IGCSE - Year 11

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What is the purpose of sensors in monitoring and control systems?
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FAQs on Sensors - Computer for GCSE/IGCSE - Year 11

1. What is the difference between a monitoring system and a control system?
Ans. A monitoring system is designed to gather data and provide information about a particular process or environment. It does not actively make any changes or adjustments based on the data collected. On the other hand, a control system not only monitors the process but also takes action to maintain or adjust the system based on the data received.
2. How do sensors contribute to feedback loops in systems?
Ans. Sensors play a crucial role in feedback loops by providing real-time data about the system or process. This data is used to make decisions and adjustments within the system to maintain optimal performance. Without sensors, feedback loops would not be able to function effectively.
3. Can sensors be used in both monitoring and control systems?
Ans. Yes, sensors can be utilized in both monitoring and control systems. In a monitoring system, sensors collect data to provide information about the system's performance. In a control system, sensors not only collect data but also trigger actions or adjustments to maintain the desired state of the system.
4. What are some common types of sensors used in feedback loops?
Ans. Some common types of sensors used in feedback loops include temperature sensors, pressure sensors, proximity sensors, light sensors, and motion sensors. These sensors help monitor and control various aspects of a system.
5. How do sensors improve the efficiency and effectiveness of feedback loops in systems?
Ans. Sensors enable feedback loops to operate in real-time by providing accurate and timely data about the system. This data allows for quick decision-making and adjustments to be made, leading to improved efficiency and effectiveness in maintaining the system's desired state.
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