Answer: Wireless electricity transmission, or wireless power transfer (WPT), is the technology of transmitting electrical energy from a power source to an electrical load without using physical wires. This technology works primarily through electromagnetic fields. There are two main methods:

• Near-field (non-radiative) techniques: These are used for short distances, typically a few centimeters. The most common method is inductive coupling, where a coil in a transmitter creates a magnetic field that induces a current in a nearby receiver coil. This is the technology behind wireless charging pads for smartphones and electric toothbrushes.

• Far-field (radiative) techniques: Also known as power beaming, these methods use electromagnetic radiation like microwaves or laser beams to transmit power over longer distances. This requires the transmitter to be aimed directly at the receiver. While still in the research and development phase for large-scale applications, this method has potential for powering drones, satellites, and other remote devices.