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Do we use AC or DC to charge a battery ?

in Electrical Engineering

Do we use AC or DC to charge a battery ?

1 Answer

We use DC (Direct Current) to charge a battery.

Here's why:

Batteries store energy in a form of direct current (DC). The flow of current inside a battery always goes in one direction, which is what DC is.

If we used AC (Alternating Current) to charge a battery, the direction of current would change continuously (back and forth), which could damage the battery or make it not charge properly.

So, to safely charge a battery, we convert AC from a power outlet into DC, using a rectifier or charger designed to provide a steady DC output. This is why most chargers you use for devices like phones, laptops, or even electric vehicles use AC to DC conversion.

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