How Does Wireless Charging Work?

How does wireless charging work? How is electricity getting from the charging pad to your phone, or in the case of the Galaxy S10, from one phone to another, through thin air?
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When you set your phone on a wireless charging pad, or use wireless PowerShare on a Galaxy S10, what, exactly, is happening?

Normal charging works by electricity flowing into the charger from the power outlet. This electricity’s voltage is too high for your cellphone and would make it blow up, so, inside the charger is something called a transformer, which can alter the voltage of electricity. In chargers, it lowers the voltage to safely transfer electricity to your phone. A transformer that lowers voltage is known as a step-down transformer.

Transformers coil a wire, called the primary current, around an iron bar, the core. On the other side, another wire is coiled, the secondary current. In the transformer, electricity passes through the primary current to the secondary current via the electromagnetic fields interacting with each other. If we want a lower voltage of electricity, the second coil of wire needs to have less turns than the first.

In wireless chargers, transformers have more than one purpose. Along with lowering voltage to safely power your device, they can also transfer electricity wirelessly. Remember how the electricity passed from the primary to the secondary current? Wireless chargers work by keeping the primary coil in the charging pad, but putting the secondary coil in the device. As long as the electromagnetic fields are close enough to interact, power can be transferred into your phone to charge it. Usually this means the device must be on, or very close to the charging pad to work. This technique of wireless charging is called electromagnetic induction.
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[PuzzlesExplained]

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[am]

Great video! I've always been curious about this. I saw a video about wireless LED lights and was confused about how they worked, but it seems its about the same concept as wireless charging. Two separate coils and electromagnetic induction!

[vslightning]

Yo man. Solid video! Great information!

[frizz]

Great Information! Keep on doing what your doing!

[drippiemikk]

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