Thread: AC Chargers - Watts? Volts? mAmps?
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Old 05-14-2016, 03:19 PM   #5
dwig
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Quote:
Originally Posted by odamizu View Post
Is a 5W USB charger the same as a 5V charger?

I have 2 Sony chargers:

#1: 5V 1,000 mA
#2: 5.2V 1,500 mA

And then there are the Kindle official chargers:

#1: 5W 1A
#2: 9W 1.8A

I am confused. How do watts and volts and mA compare?

Thanks!
As Yolinda correctly stated, with DC, like we are dealing with here, it is a simple formula, Watts = Volts x Amps. Also, 1 A = 1000 mA (the "m" means 1/1000th).

With the Kindle chargers you can tell that they operate at 5v since 5W / 1A = 5V and 9W / 1.8A = 5V. The Sony #1 would also be 5W and #2 would be roughly 7.6W.
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