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The polarity of a circuit is dependent upon the type of circuit. Direct current circuits have one negative pole and one positive pole and they flow in one direction. Alternating current circuits the electron flow reverses because the tow poles alternate between negative and positive.

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What is polarity protection in trunk circuit in telephone?

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What does negative polarity mean with electricity?

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What is mean polar?

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What test would identify a short circuit in a lighting circuit?

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