a few years ago, you should have a USB device ensures proper power supply, while the USB charger is not always labeled. Now, you can recharge the smartphone anywhere thanks to the standard connector: micro USB. the risk of the insert USB
Just not all connector charger and USB cable the same tablet. There is a larger current capability. There are times when a single USB port on your laptop power supply is stronger than the other ports, so it must be vigilant
In some desktop PC, you can still fill up the smartphone through its USB port even though the PC is turned off. How can?
Four Specifications
Currently there are 4 USB specs: USB 1.0, 2.0, 3.0, and 3.1. Plus there are additional future new connector: USB-C.
In the USB network, there are acting as host and device. PC usually be the host, and a smartphone, tablet or camera into the device. Electricity always flows from the PC to the device, but the data can go both ways.
A USB connector has four pins, and the USB cable has 4 wires. Pin-pin on the inside carry the data (D + and D-), and pin-out pin connecting the power supply 5 volts. Based on this specification, the USB port can be divided into three: a standard downstream port, charging port downstream, and a special charging port. The first two can be found in the computer, while the third is present at the wall outlet (wall charger).
The spec USB 1.0 and 2.0 specifications, standard downstream ports capable of carrying up to 500mA (0.5A); in USB 3.0, the figure rises to 900mA (0,9A). Charging port and charging downstream supply devoted to 1500mA (1.5A). While USB 3.1 raise output to 10Gbps on so-called SuperSpeed + mode, so almost equal to the first generation Thunderbolt. It also supports drag Data 1.5A and 3A via the 5V bus.
USB connector-C is not so. First, he can get into everything. This means you can attach arbitrary and will still work. USB does not work like that. Furthermore the USB-C theoretically has 2x USB 3.0 output and bias clicking more power output. The new MacBook, Apple provides a USB 3.1. Similarly, Google with the Chromebook Pixel. But there's also a USB port that is long and can support 3.1 standard.
Spec USB port also allows for "sleep-and-charge". That is, the USB port on the computer is turned off remains active. An example is your desktop PC. Although you have shut off, there is always a force that flows through the motherboard. That's why you'll see light lit optical mouse. However, some laptops also have the ability to sleep-and-charge.
USB Device Can Explode?
There is an interesting question posed friend. He has a number of USB devices. iPad, iPod, (some) smartphones, notebooks, tablets, and digital cameras. Each device includes a USB charger to recharge the device's battery. But its capacity is not the same. Charger Apple iPad, for example, provide 2,1A at 5V; Amazon Kindle Fire clicking output of 1.8; while the car charger can be output ranging from 1A to 2,1A.
So there is great variation between normal USB port with 500mA rating and a special port to charge that can reach 3000mA. The question is, if a smartphone is equipped with a 900mA charger driven into a powerful iPad charger 2100mA, whether this smartphone will explode and disintegrate?
The short answer is no! You can plug the USB device into any USB cable and nothing is going to explode. Even using a larger charger will actually speed up the process of charging the battery.
The answer again, your age also have an important role in determining how quickly it can be recharged, and whether it can be filled with a wall outlet (wall charger). In 2007, the USB Implementers Forum released Battery Charging Specification, which standardizes a faster way to charge USB devices, either by pumping more amperes through a PC USB port, or by using a wall charger. Shortly thereafter, a USB device with specs like that also appeared.
If your USB device modern - usually do it if you have a smartphone, tablet, or a camera - you should be able to plug it into the USB port with high electric current and cut the charging time. But if perangkatmu long, maybe he could not work with existing USB port Battery Charging Specification. He may just want to work with USB 1.0 or 2.0 port old original (500mA). In some cases, only the older USB devices can be charged from a computer using a certain driver (usually proprietary).
Hmm, there are some other things that need your attention. Although the PC you have two types of USB ports - charging standard downstream or downstream - OEM is not always labeled as such. As a result, you may have to charge the device from one port on your laptop, but not from other ports. It's the nature of the old computer, because when there is no reason why dowstream standard port should be used, when there is the charging port with high electrical currents. A number of vendors are now labeled a small flash icon at the top of the charging port on the laptop. In some cases, this port can still be used even when the laptop is closed.
In the same way, some external device - usually a hard drive and an optical drive - expect more power can be supplied from the USB port. That's why the hard drive and optical drive cable-Y includes a two-port USB or AC power adapter.
And if the USB connector-C became popular, you will be pleased. Needless to mistakenly insert the USB again
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