Suppose you are away from the office and need your presence or power in the office immediately. You can not reach office timely. So you can call the concerned people and tell them that you assigned a person(any of your immediate subordinate)as your deputy for handling issues in your absence and he has the full power......This is called wire less power transmission.
You can expect so many rubish answer also. Stick with this answer only.
If significant distance is involved, power can be transmitted by a sending antenna to a receiving antenna. On present technology, so far as I know, the practical amount of power is rather small. Large-scale microwave or laser technology might improve on this, depending on how far the state of the art has advanced.
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