Can I Use a Charger that Provides the Same Voltage but a Different Amperage?

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I’d like to know if it is okay to use a different power charger for my netbook. Originally, the charger specs are 19v and 1.58A. This charger is not available anymore and I can only find a 19v and 2.15A. Can I use this as a replacement?

Yes — with a couple of caveats, of course.

If it’s not made specifically for your particular computer, getting the right power supply is important, and involves matching voltage, amperage, and polarity.

Each have different constraints.

Read moreCan I Use a Charger that Provides the Same Voltage but a Different Amperage?

Why don’t all USB chargers work on all USB devices?

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I guess I don’t really get USB charging especially with our Apple devices. My little mind says that five volts is five volts; apparently, some five volts are different than other five volts. We have more Apple devices in our house than an Apple store. OK, maybe not quite, but for convenience, I’ve bought a number of third-party USB charging devices, including those little cube shaped USB chargers. What blows my mind is that some devices work on some chargers, but others won’t work on the same chargers. “Charging is not supported with this accessory” is a frequent message. There seems to be no logical pattern to this. Initially, I thought it was related to the change in charging that Apple did a few years ago when they dropped support for 12-volt stuff. I think that was around 2007, but all of our devices are newer than that except my trusted iPod video 5G; that charges on almost all of the USB chargers that I’ve bought. Why is five volts not five volts?

To begin, five volts is five volts. That’s an absolute measurement.

But there is more to it than that, as you might imagine.

Let’s look at it in more detail.

Read moreWhy don’t all USB chargers work on all USB devices?