From smartphones to laptops, we charge multiple devices every day, many of which use a USB cable to transfer power. But Does the longer the length of the USB cable cause the charging quality to decline? We will examine this issue further.
Does the length of the cable matter?
The length of the USB cable can affect the amount of electricity that is transferred from one end to the other. It can have an effect, but the situation is not that simple. First of all, just because the USB cable is long, we cannot claim a decrease in charging speed. But before we go into detail about this, we should first talk about the importance of cable length.
When electric current flows through a wire, it is not a free flow. Rather, in fact, the electric current meets the resistance of the wire, which leads to energy loss. As a result, when the electric current reaches its destination, its voltage is usually somewhat lower than the source voltage. However, the resistance between the top and the bottom of the wire depends on several factors, apart from the length of the wire, we can refer to its cross section, temperature and materials used to produce the wire.
The longer a wire is, the more resistance the electric current encounters in its path. Therefore, a one-meter cable naturally shows less resistance than a two-meter cable. On the other hand, as we said, temperature is another important factor in this field, and as a result, for example, if you are charging your phone in a hot environment, the resistance increases. Its cross section is inversely proportional. This means that the thicker the wire, the less resistance the current will face. But thinner wire shows more resistance. Finally, we should not forget the importance of the materials used for the wire. Silver has the lowest resistance, followed by copper, gold and aluminum. Most USB cables use copper because it is cheaper than silver. Of course, some of them use copper alloys to increase strength.
In general, we must say that yes, the length of the USB cable affects the charging speed. But is this voltage drop significant?
Does a longer USB cable mean slower charging?
Although the length of the cable is very important for the charging speed, among the factors mentioned , the cross section of the wire is the most important. Since the voltage drop in the cable is an unavoidable fact, companies usually use more thickness for longer wires to reduce the amount of resistance. But if this is not done, such cables reduce the voltage significantly. Brands that are not known usually do this to reduce costs.
According to the standards provided by the USB-IF regulatory body, the voltage drop of the USB cable should not be more than 0.5 volts. This means that if the charger in question can provide 3 amps and 5 volts, in ideal conditions the phone should receive 15 watts. But taking into account the 0.5 volt drop, you will face 13.5 watts of power. Therefore, if you want to buy a USB cable, we recommend you to choose from products made by famous companies.
Do you need to worry about the length of the USB cable? Be?
Although technically the length of the USB cable affects the charging quality to some extent, but as a consumer and buyer, you should not worry about this issue. Most users use USB cables of one to two meters, and those who want to use longer cables should pay attention to the USB-IF certificate and famous brands.
- Why the phone charging speed when the battery It is almost full, will it be much less?
Source: How To Geek< /a>