Cell phones, or perhaps the Smartphones available now days are indeed a convenience. They have made our lives much less intricate by simplifying the daily tasks. Phones have replaced a number of devices including music players, iPads, GPS devices, organizers, cameras, calculators, watches, and in much sense laptops and computers as well.
Low Battery The Only Challenge
Since these devices are so functional, they eat up a lot of power the battery backup of a normal Smartphone won't even last for a day if used heavily. Phones and nearly all the electronic devices these days have the ability to draw power through a USB connection. The users can connect the USB power port to either to a wall outlet or to the USB port of a laptop or computer.
Both the methods would certainly charge your device; however both of them have their own benefits and pitfalls
Understanding the Difference between Wall and USB Charging
Efficiency If you are using a typical USB port for charging, it usually can supply almost 500 milliamps of current at a point of time. Conversely, a wall outlet can supply far more electrical current. Wall outlet generally has the ability to around 15 to 20 amps of power, whereas the device chargers are restricted to 2 amps of power at the most. Therefore, if you charge the device directly from a wall outlet, it would be comparatively faster than that of using a USB port.
Ease of Charging Multiple Devices Since your devices can be effectively charged from a USB port, this implies that you need not to carry separate chargers for different devices wherever you go. There can also be situations where the outlets are limited. In that case instead of finding separate outlets or worse waiting for one device to charge so that can charge another, you can simply plug the laptop charger to the wall and charge other devices through USB ports. Although the charging will be slower yet it will be getting charged.
USB A Standard USB is a standard worldwide which means that whether you travel countries or even continents, the USB port and its function will still remain the same. On the other hand, wall current and the outlets may vary from one region to another as they are not standardized. In that case you may require converters.
Power Consumption While charging from a wall outlet, the high-energy power is stepped down to the low-energy one, this wastes a considerable amount of power and the unused power is radiated as heat. Alternatively in the USB charging, there is nearly no energy wastage since the power is already being converted by the laptop charger.
Although for the convenience there are car chargers as well, yet the benefit of cell phone wall chargers can also not be overlooked when it comes to charging the devices as quickly as possible.