Alternating voltage
a voltage that reverses direction in regular cycles.
historical examples
i want to wait until you have seen what the crystal does when an alternating voltage is applied to it.
letters of a radio-engineer to his son john mills
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to interchange repeatedly and regularly with one another in time or place; rotate (usually followed by with): day alternates with night. to change back and forth between conditions, states, actions, etc.: he alternates between hope and despair. to take turns: my sister and i alternated in doing the dishes. electricity. to reverse direction or sign […]
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noun (brit, education) any course of study offered as an alternative to the national curriculum