Arduino and USB power, what to choose I am a beginner at Arduino. I want to power the Arduino through the USB cable that is usually plugged in the USB of the laptop, but plugged in the wall instead of the laptop.

Here are my questions:


Can I use a phone charger that has a USB (in which the end of the USB
cable will go instead of the USB of the PC)?
What should I look for written on the charger so it is best
compatible? 
Is it ok to be done that way?
Will it be the same as means of power like when it is plugged in the
PC (for example when later on I connect LCD display, diodes, etc.)?


I did my research, but it got confusing, so I wanted to ask my own question. Thanks in advance.
Yes, you can power the Arduino using a USB phone charger.

The Arduino Uno draws less than 100mA when connected by itself. So ideally you would want the USB phone charger to provide at least 100mA. All of the USB chargers I have come across to date provide more than 400mA. Most of the modern USB chargers provide upwards of 1A for fast charging of your phone.

A USB(2) port of a laptop can provide up to 700mA to the Arduino (500mA continuous).

In terms of the overall current draw, it really depends on what you have connected to the Arduino. LEDs generally draw 20mA or less per LED. Some screens can draw anything from &lt;100mA to a couple of amps. Most of the screens I have come across draw less than 1A. It really depends on the devices you want to connect. 

For the most part, a USB charger will be sufficient.