USB is the power source for digital devices. For devices with built-in batteries, connect the data cable to the USB-AC adapter or move the battery to ensure power supply. Many devices such as smartphones and smart watches are connected once a day, so it is important whether the charging speed varies depending on the length of the cable.
USB charging speed may vary depending on cable length
In short, the charging speed of USB will vary depending on the length of the cable. This is because the cable made of metal has internal resistance. If the value is large, the voltage will drop and current will be difficult to flow. Longer cables tend to have lower voltages because the resistance is proportional to the length of the cable. The thickness of the cable is also important. Since the resistance value is inversely proportional to the thickness of the cable, the thicker it is, the more it can prevent voltage drop.
USB power supply (VBUS) is sometimes defined as 5V±0.25 by the standard. If the voltage drops beyond this range, the operation may become unstable, so it cannot be ignored. In other words, assuming all other factors are the same, a shorter cable has a better charging speed. Different from life, for USB cable charging, "thick and short" is better than "thin and long". However, in addition to the length/thickness of the cable, there are several factors that affect the voltage/current, such as the contact resistance of the connector. No wonder there are reports that there are more than a few percent difference when measuring power loss between high-quality USB cables and non-quality USB cables.
If you want to shorten the charging time as much as possible, reduce loss, and improve efficiency, use a commercially available USB current/voltage detector to find a good wire, or use a reliable manufacturer/brand of high-quality wire, let's choose. Because it is used every day, if you calculate it 365 days a year in ○, it may turn out that high-quality, high-performance USB cables are more profitable, even though they are expensive.
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So whether the charging speed has something to do with the length of the cable. What do you think? Thank you for reading and hope it will help you!
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