OCR · Design and Technology · J310
GCSE Design and Technology: How do electronic systems provide functionality to products and processes?
Technical understanding · OCR GCSE Design and Technology (J310), specification point 6.4. Cards are generated from the exam board's own specification for "How do electronic systems provide functionality to products and processes?", and every card links back to the page it came from. Specification © OCR — used with attribution.
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What does LDR stand for in electronics?
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Light dependent resistor.
What quantity does a light dependent resistor (LDR) sense?
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Light level. Its resistance falls as the light gets brighter, so the circuit can respond to light and dark.
What does an infra-red sensor detect?
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Infra-red radiation, e.g. body heat or a reflected IR beam — used to sense presence, movement or obstacles.
Which type of switch is triggered by a change in orientation?
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A tilt switch — it opens or closes the circuit when tipped past a set angle.
How does a push-to-make switch behave?
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It completes the circuit only while the button is held down; releasing it breaks the circuit again.
What does a time-delay switch do?
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It switches an output on or off after a set period rather than instantly.
Are sensors and switches input or output devices in an electronic system?
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Input devices — they respond to conditions such as light, heat, movement or a press and feed a signal into the system.
What does LED stand for?
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Light-emitting diode — an output device that produces light.
Which two output devices produce sound in an electronic product?
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Speakers and buzzers.
In an electronic system, ? are the output devices used to produce motion.
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motors
What is a microcontroller?
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A small programmable chip (processor, memory and input/output pins) that can be programmed to control a product's inputs and outputs.
Why are microcontrollers embedded in products?
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To embed functionality: the program lets the product's operation be enhanced and customised without changing the hardware.
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