13A / USB socket power drain?

Let me simplify that for you:

Don't bother!

The USB power standard evolves every 2-3 years and those are already obsolete 2 years ago.

USB Type C is coming with a top power of 100W.

You can get some very nice 4-in-1 plug type PSUs and 4-6 in 1 on-a-lead power packs - and these a) can be turned off; b) replaced easily when no longer of much use.

It doesn't matter, as they're a poor idea and best avoided. USB power is a fast changing field, and most such sockets are obsolescent even when new.

NT

Yep though USB type A seems to have stuck as the universal host connector.

There is a local switched mode AC to DC converter inside it almost certainly moderately efficient with losses

The only way to tell would be to measure one. Even the datasheets don't say eg.

Picking a random non integral one with a datasheet suggests as I would have guessed unloaded standby power consumption

There are phones with "quick charge" that want 15W, so yesterday's 2A chargers are old-hat.

I have one device with USB C, it's only a USB2 device not USB3, so it did come with a USB-A to USB-C lead, I expect USB-C to USB-C will slowly become the norm ... The latest MacBooks and ChromeBooks come with USB-C at the host end.

Yes, that's the way it will do it, 5A/20V I think.

Which on a per household basis isn't that big a deal, but across the

And, at long last, a connector you can insert either way round ;-)

(Rather than the 270 degree rotation required with current ones)

The main problem with distributing 5V any distance is voltage drop.

Without taking one apart its hard to tell. Chances are they are "switching" converters, and hence power dissipation on no load will be negligible (much as it is with modern phone chargers)

With a traditional linear supply that could be the case, but its not going to be that bad with a SMPSU.

Personally I would be more worried about the quality of the PSU than its quiescent current draw. Many USB chargers are of fairly low quality, have poor mains to 5V separation, and are not designed to intrinsically fail safe. That's bad enough on something you plug in, and even less desirable on something hard wired in.

There has been some testing done on them:

I thought Apple were going in the right direction with their reversible MagSafe plug - until they started going in the wrong direction by not making newer versions backwardly compatible.

Nick

And now they've dropped it altogether.

:o(

No - they jack the voltage up too - by negotiation.

The idea is to take "USB Power" to the next level and power laptops too.

I like the USB C - much more robust and reversible. Two problems solved. But the Type A has done damn well as a form factor. How long is it? 20 years?

Not a moment too soon! Micro-USB was the ultimate abortion. Talk about bad idea for something that's shoved in and out 1000 times a year.

Apple - backwards compatible? When did that happen?

Like all those things with an Apple iPod dock, all now obsolete and useless.

Its another few percent on a typical bill, people are fitting new bulbs to save that sort of money.

I once did the sums to see what happened if everyone went for an IP phone rather than a proper one and that needed a couple of nukes.

We've done our bit. This house has ten IP phones!

Snicker. ;O)

Few would use it as much as that, most wouldn?t use it more than daily.

One big advantage of micro-USB is that its designed to wear out the much easier to replace cable rather than what it plugs into so it's very easy and cheap to replace when it does wear out.