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So here it goes,after looking out hundreds of pages regarding powering of Raspberry Pi 3B+ still some hesitations here.

I have totally read this out very detailed & nicely written answer by Milliways & official Raspberry Pi documentation along with many Reddit post. I came to know that i can use any power adapter of any output current rating provided that it ( adapter) capable delivering constant 5 Volts(±0.25V) supply.

As Raspberry Pi itself will draw only amount of current it needs from adapter as long as voltage provided to board is constant as standard input rating.

So my concern is can i go for power adapter which can deliver 3.4 Ampere or Qualcomm QC 3.0 capable( as it can deliver 5V-3A or 9V-1.6V or 12V-1.2A) as Raspberry Pi capable of handling current value.

Pritish Pandit
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The short answer to your question is no, as long as it outputs 5V the worst it can do is not supply enough current (see footnote).

Raspberry Pi capable of handling current value.

That's not how electricity works, at least in a power supply context. Devices have a minimum current rating, and supplies have a maximum rating. The supply only sources the current that the device sinks, ie., if the device only needs 2A but the supply has a maximum of 4A, the supply is fine -- it can deliver 2A. Note that the current draw of an electronic device like the Pi can fluctuate substantially depending on the internal needs of its components; it may draw < 1A when idle with no powered peripherals.1

So what's important is that the device's requirements are less than or equal to the maximum current output of the supply. Not that this logic does not apply to voltage, which must be a close match, and unlike current, should not substantially fluctuate.

  1. This is significant in that power supplies that are really intended only for recharging things may not be designed to handle this fluctuating draw, in which case the Pi may brown out under load. This may cause SD card corruption, but it should not damage the Pi.
goldilocks
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