USB chargers are currently the most common devices that are used in charging Smartphones and tablets. The devices are of three main specifications: USB 1.0, 2.0, and 3.0. Of the three, USB 2.0 is the most common.
In the USB network, there is always the host and the device. For example, if you are using computer to charge your phone, you PC becomes the host and you phone becomes the device.
If you are using a wall charger, the charger becomes the host and your tablet or phone becomes the device. In all times, power flows from the host to the device.
If you look closely, you will see that a USB socket has four pins. The USB cable also has four wires. The inside pins carry data (D+ and D-) while the outside pins provide power.
It’s good to note that different USB ports charge the devices attached to them differently. For example, you will find that one port charges your phone fast while another port charges the same phone very slowly.
There are two factors that determine the speed at which your device charges over USB: the maximum amperage of the USB socket or wall charger and how your device takes up power from the charger.
All chargers have maximum amperage which is usually between 500 milliamps and 1.5 amps. In most cases a PC has 500mA while the max amperage of a wall charger varies from one device to another. Although, this is the case, the amperage of wall chargers is usually between 0.5A and 2.1A.
How your device negotiates with the charger greatly determines how your device charges. When you plug your device to the wall charger or charging socket, the USB controller in your device communicates with the USB controller attached to the charger.
If there is no controller, the device reads the voltage flowing across the USB pins and from the data the device decides on the amount of amperage that it should draw.
Can a USB device blow up during charging?
The answer is No. You can plug any USB device into any USB cable and into any USB port without any problems and your device won’t blow up. This means that you can connect a Smartphone which came with a 900mA charger into a 2100mA and the device won’t blow up.
According to experts, connecting your device to a higher power source doesn’t result to blowing up of the device, but instead speeds up the rate at which the battery charges.
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