Will my iphone charger give same USB voltage as usb port?

[bydus]

I'm just wondering if I can use my iphone usb wall charger to charge/vape with my tornado passthrough ?

[cammy uk]

hi

if the output is 5v then that will be ok. i used a sony walkman charger to charge my titan batts and that was fine

[CraigHB]

Short answer, yes.

Long answer; USB ports are 5V per their specification.  That's why you're finding a lot of devices using them as charging/power ports these days.  With the old style round plugs, it was possible to put the wrong charger on the wrong device.  Not possible with a USB port.  The only caveat with USB ports is the current draw.  The specification states 500ma or half an amp, but some devices can go slightly over and some ports do not support the full current specification.  With wall chargers, it's rarely an issue, but can be with computer ports.  The Tornado passthru (and USB charger) does approach the current limit.  Unlikely to be a concern with a wall charger, but can be a concern with some computer ports, especially laptop computers.

[SittingNow]

Short answer, yes.

Long answer; USB ports are 5V per their specification.  That's why you're finding a lot of devices using them as charging/power ports these days.  With the old style round plugs, it was possible to put the wrong charger on the wrong device.  Not possible with a USB port.  The only caveat with USB ports is the current draw.  The specification states 500ma or half an amp, but some devices can go slightly over and some ports do not support the full current specification.  With wall chargers, it's rarely an issue, but can be with computer ports.  The Tornado passthru (and USB charger) does approach the current limit.  Unlikely to be a concern with a wall charger, but can be a concern with some computer ports, especially laptop computers.

Actually some USB ports can output at up to 10w. USB 2 defaults to 5w, but can output at 10 if the device requires it. A good example of this is the iPad. My iPad charges on my Mac Pro, but not my PC, as the Mac Pro checks the device first.

[CraigHB]

True, but most ports only support half an amp so unless you know for sure, it's probably better not to find out the hard way.  Many devices (like the Tornado passthru and charger) that simply tap a USB port as a power source do not comprise the necessary electronics to perform data exchanges which query for specification compliance.  It would be nice if all USB ports supported the newer power specifications, but as often is the case, they never anticipated the need in the earlier ones.

There are other considerations as well.  It's hard to find USB patch cables rated for more than a half an amp.  Even at rated currents, cable losses can cause inadeqate power delivery to a device.  A 28 gauge 6 foot USB cable can drop as much as a half a volt accross the cable at half an amp.