Yet it's scarcely visible in the market for solar panel inverters, devices that turn the direct current power generated by solar panels into alternating current for the grid.

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Infineon also provides the thyristor chips that allow transformers to handle high-voltage direct-current power lines.

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The reserve power category includes backup batteries and related products that provide a continuous supply of direct current (DC) during power outages.

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Inverters and microinverters convert the direct current (DC) power produced by solar panels into alternating current (AC) used in homes and businesses.

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Direct current is ideal for moving power long distances and for moving power underwater or underground.

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Diodes are essential in radios to turn rapidly oscillating radio waves into a smoother direct-current signal that can power a speaker.

ECONOMIST: The middle age of the transistor

But Thomas Edison's idea--that power should be distributed as direct current--is being revived.

FORBES: Magazine Article