usb current rating question

pk_volt · 05-16-2008, 04:19 AM

Anyone know what the current rating is for the usb port on my laptop? I tried googling around, but couldn't find anything specific only except the contacts can draw up to 1 amp.

I think other than that, is it limited to what the power supply can draw?

randomtask · 05-16-2008, 04:44 PM

Isn't an Ampere actually a given measurement of the current draw?

I'm not superduper with electronics, but my understanding is that you have-
The volts which is the force behind the power, the Amps which is the power (the current.), and the Ohms which is the resistance, the given load/wire has on the current.

msgwtco · 05-23-2008, 09:56 AM

500mA is the USB standard

pk_volt · 05-23-2008, 08:07 PM

sources?

msgwtco · 05-23-2008, 08:38 PM

USB in a NutShell - Chapter 2 - Hardware

This describes the USB current specs as well as other info.

pk_volt · 05-25-2008, 11:37 AM

ah, thanks for posting that link.

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05-16-2008, 04:19 AM	usb current rating question	permalink #1
pk_volt Senior Member Jan 2005 Last Seen: Yesterday Posts: 289 (#132) Thanked 0x in 0 posts x1	Anyone know what the current rating is for the usb port on my laptop? I tried googling around, but couldn't find anything specific only except the contacts can draw up to 1 amp. I think other than that, is it limited to what the power supply can draw?

Yesterday, 05:30 PM	#2
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05-16-2008, 04:44 PM	permalink #2
randomtask Chimp. Jan 2005 Last Seen: Yesterday Location: australia Posts: 1,766 (#53) Thanked 1x in one post x25	Isn't an Ampere actually a given measurement of the current draw? I'm not superduper with electronics, but my understanding is that you have- The volts which is the force behind the power, the Amps which is the power (the current.), and the Ohms which is the resistance, the given load/wire has on the current. Last edited by randomtask; 05-16-2008 at 04:47 PM.

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05-23-2008, 09:56 AM	permalink #3
msgwtco Some Random Person Jan 2005 Last Seen: Yesterday Location: Waterbury,CT Posts: 623 (#109) Thanked 0x in 0 posts x7	500mA is the USB standard

05-23-2008, 08:07 PM	permalink #4
pk_volt Senior Member Jan 2005 Last Seen: Yesterday Posts: 289 (#132) Thanked 0x in 0 posts x1	sources?

05-23-2008, 08:38 PM	permalink #5
msgwtco Some Random Person Jan 2005 Last Seen: Yesterday Location: Waterbury,CT Posts: 623 (#109) Thanked 0x in 0 posts x7	USB in a NutShell - Chapter 2 - Hardware This describes the USB current specs as well as other info.

05-25-2008, 11:37 AM	permalink #6
pk_volt Senior Member Jan 2005 Last Seen: Yesterday Posts: 289 (#132) Thanked 0x in 0 posts x1	ah, thanks for posting that link.

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