correct typo
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@ -41,7 +41,7 @@ equal and opposite signals.
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Twin feeder is balanced because neither wire is grounded. Both have the same
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impedence to ground in a symmetrical fashion. If wire A is at +5V, wire B will
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be at -5V. Because of [alternating current](./Voltage_sources.md), they swap
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over their potential difference at each cycle, making them effeectively
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over their potential difference at each cycle, making them effectively
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interchangeable.
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