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<p><b>Wireless power transfer</b> (<b>WPT</b>; also <b>wireless energy transmission</b> or <b>WET</b>) is the transmission of <a href="page.php?w=electrical_energy">electrical energy</a> without <a href="page.php?w=wire">wire</a>s as a physical link. In a wireless power transmission system, an <a href="page.php?w=electric_power_source">electrically powered</a> transmitter device generates a time-varying <a href="page.php?w=electromagnetic_field">electromagnetic field</a> that transmits power across space to a receiver device; the receiver device</p><p>
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