Worlds of David Darling
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  1. The process of changing from one physical state (solid, liquid, or gas) to another, with a necessary or coincidental input or release of energy.

  2. Alternating current is carried by conductors and a ground to residential, commercial, or industrial consumers. The waveform of the phase power appears as a single continuous sine wave at the system frequency whose amplitude is the rated voltage of the power.

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