Wireless chargers use electromagnetic fields to transfer energy from a charging pad to a device without cables, relying on coils in both the charger and device to generate and receive current.
How Wireless Charging Works
Wireless charging, also called inductive charging, transfers energy through electromagnetic induction. A transmitter coil in the charging pad generates an oscillating magnetic field when connected to power. A receiver coil inside the device picks up this magnetic field, inducing an electric current. The device then converts this current into direct current (DC) to charge its battery.
This process is based on Faraday’s law of electromagnetic induction, which states that a changing magnetic field can induce voltage in a conductor, and Ampere’s law, which explains how electric currents generate magnetic fields. The coils must be very close—usually just a few millimeters apart—for efficient energy transfer.

Types of Wireless Charging
Inductive Charging: Requires direct contact between the device and charger, such as placing a phone on a charging mat or using Apple’s MagSafe system.
Resonant Charging: Allows slightly more distance between the charger and device, using tuned resonant circuits to transfer energy more efficiently over a short gap

Wireless Chargers

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