The big idea: A microcontroller costs pennies, so there is one in a kettle, a toothbrush, a doorbell and a greetings card.
A decision that wastes half a watt, or glues in a battery, is therefore repeated a hundred million times. Responsibility in electronics is about scale, not about any one product.
Four tests, each with the mechanism and the number that make it arguable rather than hopeful.
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| Test | The question | How it is met |
|---|---|---|
| Safe | Can it hurt anyone, in use or when it fails? | Double insulation or an earth, a fuse sized to protect the cable, no accessible mains conductor, a battery that cannot be short-circuited, and a failure mode that stops |
| Energy-efficient | Does it use less energy to do the same job? | A switched-mode supply, LEDs rather than filament lamps, a processor that sleeps between events, a sensor that wakes it only when needed |
| Minimal standby | What does it draw when nobody is using it? | A true off switch rather than a soft one, a low-power sleep mode, and no radio kept awake all night for a message that never comes |
| Repairable and recoverable | What happens to it at the end? | A replaceable battery, screws rather than glue, published spare parts, and a board that separates from the case so the metals can be recovered |
Numbers turn an intention into an argument: "It is energy-efficient" is a hope. "An LED gives the same light for about a tenth of the power of a filament lamp" is an answer.
Two more worth carrying: standby power is capped at 0.5 W per device across the EU, and a fuse is rated to protect the cable, not the appliance.
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| What electronics improve | What comes with it |
|---|---|
| Safety — a smoke alarm, an RCD, a reversing camera, an implanted pacemaker | A product that fails silently: a smoke alarm with a flat battery looks exactly like one that works |
| Independence — hearing aids, powered wheelchairs, voice control, medication reminders | Dependence on a manufacturer's servers and software support for the product's whole life |
| Efficiency — a boiler that modulates, a washing machine that weighs its load, a motor that runs at the speed needed | Energy and materials spent making the electronics, and a shorter life than the mechanical part it controls |
| Access to information — the whole of the internet, in any pocket | Electronic waste is the world's fastest-growing waste stream, and most of it is not collected |
The one that catches designers out: Adding electronics to a durable product can shorten its life.
A mechanical dishwasher timer lasted twenty years. A control board lasts eight, is not repairable, and is not stocked after five — so a working machine is scrapped because of a part worth a few pounds.
How this is tested — identifying electronic products that are safe, energy-efficient and use minimal energy. It comes up two ways:
Paper 1 — multiple choice
- Identify the feature that makes a product energy-efficient.
- Choose which design change reduces standby power.
Paper 2 — analysing a product
- Explain how a named product could be made more responsible.
- Evaluate the effect of adding electronics to a durable product.
The trap: Answering with adjectives. Every mark here needs a MECHANISM — a sleep mode, a replaceable battery, a fuse sized to the cable — and where possible a number.
A manufacturer replaces the mechanical timer in its washing machine with an electronic control board and a phone app. Evaluate this decision.
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