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Can any signal have no energy?

Updated: 8/17/2019
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14y ago

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In order for a signal to be detected, it must impart energy to the receiver, so, no, there are no signals that have no energy. It might seem that there is no energy. If you carefully consider capacitive and inductive reactance, however, you will note that current and voltage can be out of phase. If they are 90 degrees out of phase, then a "normal" meter will show no power, but there is energy transfer in any case.

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Q: Can any signal have no energy?
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