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How do electronic systems and programmable components give products their functionality?

How electronic systems power and control products using inputs (sensors), process and control devices, and outputs, and how programmable components embed functionality through flowcharts, inputs, decisions and outputs.

A focused answer to Edexcel GCSE Design and Technology 1.6 and 1.7 on electronic systems, covering powering systems, input sensors, control devices, output devices and how programmable components embed functionality using flowcharts.

Generated by Claude Opus 4.811 min answer

Reviewed by: AI editorial process; not yet individually human-reviewed

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  1. What this dot point is asking
  2. Powering systems
  3. The systems approach: input, process, output
  4. Programmable components

What this dot point is asking

This covers Edexcel 1.3.2 (powering systems), 1.6 (electronic systems: sensors, control devices and outputs) and 1.7 (programmable components). Edexcel wants you to recognise and apply the working characteristics, advantages and disadvantages of these components, and to describe a product as a system of inputs, processes and outputs. In Section A this is examined with systems diagrams, short open-response questions naming components, and Explain questions on how programmable parts add functionality.

Powering systems

The choice follows the factors from energy selection: portability, environmental impact, power output, the connections needed and cost. A wearable uses a small rechargeable cell; a kitchen appliance uses the mains; a remote sensor uses solar with a battery.

The systems approach: input, process, output

Inputs (1.6.1)
A sensor detects a physical change and converts it to an electrical signal. Edexcel names the light-dependent resistor (LDR), whose resistance falls as light increases (used to sense dark), and the thermistor, whose resistance changes with temperature (used to sense heat or cold).
Process and control devices (1.6.2)
The process block makes the decision. Edexcel names switches (which open or close a circuit to start an action), transistors (which act as electronic switches or amplifiers, turning a small signal into a larger one) and resistors (which limit current to protect components such as LEDs).
Outputs (1.6.3)
An output turns the decision into an action. Edexcel names the buzzer (an audible warning) and the light-emitting diode (LED) (a visual indicator that needs a series resistor to limit current).

Programmable components

A flowchart plans the program using standard symbols: a rounded terminator (start/stop), a rectangular process, a parallelogram input/output, and a diamond decision that branches the program. A microcontroller reads the inputs, follows the flowchart's decisions, and switches the outputs, allowing one piece of hardware to behave in many ways depending on its program. Analogue inputs (such as a temperature reading) give a range of values, not just on or off, so the program can respond proportionally. Delays, loops and counts let outputs flash, repeat or run for a set time.

Exam-style practice questions

Practice questions written in the style of Pearson Edexcel exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.

Edexcel 20216 marksA garden security light turns on automatically when it gets dark and someone moves nearby. Describe, using a systems diagram, the input, process and output devices it needs. (6 marks)
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A 6-mark question rewards a correct systems description with the right named components for each block.

Input: the system needs two inputs, a light-dependent resistor (LDR) to sense when it is dark and a movement (passive infrared) sensor to detect a person. These convert the conditions into electrical signals.

Process: a control device or microcontroller takes the two input signals and makes a decision, switching the output on only when both conditions are met (dark AND movement). This is the logic of the system.

Output: a light-emitting diode (LED) lamp is the output, turned on by the process block. A buzzer could be added as a second output.

A full-mark answer draws or describes the three blocks (input, process, output) with arrows showing signal flow and names a valid device for each. Markers reward the correct classification of each component and the AND decision in the process.

Edexcel 20224 marksExplain how a flowchart can be used to control the outputs of a programmable product. (4 marks)
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A 4-mark Explain rewards two developed points about flowcharts and control.

Point 1: a flowchart sets out the sequence of operations as symbols (start/stop, process, input/output and decision diamonds), so the designer can plan how the program responds to inputs before writing code (1), reducing errors and making the logic clear (1).

Point 2: decision symbols let the program branch, switching outputs on or off depending on an input or condition (1), and loops let a routine repeat with delays and counts so the output behaves in a controlled, timed way (1).

Markers reward the role of the symbols (especially the decision diamond) and how they control outputs in response to inputs. Just defining a flowchart without linking it to controlling outputs earns 1 mark.

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