By default, USB 3.0 ports push 5V/0.9A (4.5W).īut by upgrading to the physical USB-C connection (the oval-shaped reversible plug on newer smartphones) and USB 3.1 (and versions after it), PD can become a different animal altogether. USB 1.0 and 2.0 are increasingly rare and incompatible with our modern smartphones. The USB Implementers Forum specifies several types, one for each corresponding USB specification: USB 1.0, 2.0, 3.0/3.1/3.2, and USB4. There’s a really good reason: Besides the fact that USB cables are relatively easy to find these days, USB has a really robust, well-defined charging standard called the USB Power Delivery Specification. Unless you’re still rocking a Palm Pilot from the early ’90s, chances are your smartphone recharges via a USB cable. Watts, then, are the product of volts and amps - volts (V) times amps (A) equals watts (W). A common analogy is a garden hose: Volts are equivalent to the water pressure in the hose the current is equivalent to the flow rate wattage is equivalent to the volume of the spout’s spray. Volts are a measure of voltage, amps are a measure of current, and watts are a measure of electrical power. Since we’ll be referring to volts, amps, and watts in the course of our discussion, here’s a refresher. But to understand how fast charging works, you have to know a bit about something called a charge controller. So we’ve established how batteries charge and discharge.
But in the rechargeable lithium-ion batteries that power smartphones, the reactions are “reversible.” When the battery discharges, the chemical reaction produces electricity, and when the battery recharges, the chemical reactions absorb power.
In non-rechargeable batteries, those chemical reactions occur only once. Over time, ions - atoms with too few or too many electrons - form in the electrodes, driving a flow of electrons to the battery’s negative outer terminal and supplying your phone with an electric charge. The basics How fast charging worksīefore we dive into the weeds, let’s start with the fundamentals.Įvery smartphone has a battery, and every battery delivers power in more or less the same way.Ĭells consisting of two electrodes (one positive and one negative) and an electrolyte catalyze reactions that convert compounds into new substances. Here is everything you need to know about Samsung Adaptive Fast Charging, USB Power Delivery, Qualcomm Quick Charge, OnePlus Warp Charge, and more. Our guide to the most popular wireless charging standards on the market breaks them down to their most basic level. So how does fast charging work? Take a deep breath. The best fast chargers for your smartphone in 2022 What is Airplane Mode? What it does and when to use it
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