can i power an arduino uno that has a 9g micro servo an lcd screen and an ultra sonic sensor using a power bank
i forgot to say the power bank provides 2.1 amps at 5 v
If that is even nearly true, you can.
Some powerbanks have auto shut off for minimum current draw quite high, so you need to try
I have found this true. I have a power bank that easily charges my phone, but does not run a Nano.
No.
Yes.
But you may need to ensure your circuit draws enough current at all times to prevent the power bank from shutting down. For example you could attach a number of LEDs (with series resistors).
Obviously, deliberately wasting power like this will run down the power bank quite quickly.
I have few that do opposite, they power well devboards, but not charge my phone 
And one that does both.
These are good for up to 500mA, never ignored one devboard. They have standard 18650 holder inside.
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