What is the difference between this charger and my nook charger?

You probably just used a charger that was higher that 5W/1A, which is as low as they go. Most chargers will adapt to the device, or vice versa, but if a Kindle somehow can't handle a higher rated charger, then it's a POS, because this adapter is worth $3, tops, in 2018. It's the most generic kind there is -- it is literally the same, EXACT cheap adapter that comes with EVERY Amazon Echo, FireTV, Kindle, or Fire Tablet. So, if your gonna get waste $20 on one, you might as well spend the extra 5-20, to get an Echo, Dot or Fire Stick and use that adapter for your fragile Kindle, then use ANY other adapter (even the USB port on the back of your TV, for a FireTV Stick) to power the $20 off device you just got. Heck, you'd be best off to wait for one of the 30 sales a year that Amazon has on its electronic devices, and just get a new, better, updated Kindle for what becomes an incredibly cheap buy, at $20 off. This may be THE most overpriced item on Amazon, although you'd have to go through their entire line of Amazon Basics, to make sure. Their crap is ALL overpriced garbage.

What is the difference between this usb and the usb charger plug ins i use for my ipad, ipad mini and samsung galaxy s4 phone?

There is a HUGE difference, the iPad charger is 12W, 5.2V, 2.4A where the iPhone is 5W, 5V, 1A. I have personally fried a Android phone accidentally plugging it into my iPad charger. So, I would be careful using the iPad charger. The iPhone charger is okay to use as a substitute.

do i need a USB caBle for my kindle charger?

Yes...This item is just the plug. You will need to get the USB cable that mates with plug and your kindle

Can I use this adapter on 220 volt systems as well as 110 volt? (I know I'll need a plug adapter.)

If your charger specifies a 100-240 volt input, it will work in Europe and other places that use 50 Hz 240 Volt AC. There should be an text block (usually very faint print, very small print) on the charger that, along with the voltage range provides the hertz range (should say 50-60 Hz). So long as you have both (100-240 VAC, 50-60 Hz), it will work outside the US, with the proper plug adapter. No need for a voltage transformer. This generally holds true for all SMALL consumer electronics (cell phones, tablets, electric razors or toothbrushes) are all configured to be charged regardless of country. There are even multi voltage curling irons. BUT if your charger only says 10-120 VAC, 60 Hz, then it won't work without a voltage transformer. That would be very rare, though. Believe me, we've taken all of our small electronics overseas with a couple of these chargers and some adapter plugs only, no issues at all. Used in the UK and throughout the continent (France, Italy). Each location has their unique adapter plugs, but those are all you need.

Brand	Amazon
Item model number	53-005659
Item Weight	1.34 ounces
Product Dimensions	1.57 x 1.06 x 1.5 inches
Item Dimensions LxWxH	1.57 x 1.06 x 1.5 inches
Color	Black
Manufacturer	Amazon
ASIN	B01J2G4VBG
Date First Available	October 11, 2017

Amazon 5W USB Charger

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