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Step-down transformers lower the grid’s high voltage to levels suitable for household outlets and appliances.
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The wire can run to a metal stake driven into the soil outside the building.
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Inside the accelerometer, a microscopic suspended mass shifts relative to its frame. Gravity changes the direction of that pull when you tilt the phone,…
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As light enters and leaves glass, its speed changes and it bends. Shaped lenses use this refraction to focus or spread light, changing the image you see.
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A dog whistle can emit a tone above the human hearing range, which tops out at around 20 kilohertz, while remaining audible to dogs.
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When a second device is plugged in, the charger briefly cuts power to its ports while it recalculates how to divide the electricity, disconnecting the first…
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With both feet on the same wire, there’s little voltage difference across a bird’s body to drive current through it.
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