Solved

How many USB ports would be required for 3 Watts of Power?

Posted on 2013-06-09
5
357 Views
Last Modified: 2013-06-23
How many USB ports would be required for 3 Watts of Power?
0
Comment
Question by:hankknight
5 Comments
 
LVL 23

Assisted Solution

by:tailoreddigital
tailoreddigital earned 125 total points
ID: 39233599
From the info on the Wiki page,

2 standard USB ports or 1 USB3 port

"Standard USB hub ports can provide from the typical 500 mA/2.5 W of current, only 100 mA from non-hub ports. USB 3.0 and USB On-The-Go supply 1.8 A/9.0 W (for dedicated battery charging, 1.5 A/7.5 W Full bandwidth or 900 mA/4.5 W High Bandwidth), while FireWire can in theory supply up to 60 watts of power, although 10 to 20 watts is more typical."

http://en.wikipedia.org/wiki/USB
0
 
LVL 16

Author Comment

by:hankknight
ID: 39233619
So assuming:
Voltage: 5.00V
Current      500–900 mA (750 mA Average)

How many of those ports would it take for 3 Watts of power?
0
 
LVL 24

Assisted Solution

by:aadih
aadih earned 125 total points
ID: 39233633
One (1).
0
 
LVL 20

Assisted Solution

by:CompProbSolv
CompProbSolv earned 125 total points
ID: 39233755
Just adding here... previous answers are correct and adequate for the posted question.

It appears that you are missing the basic formula: P=E*I  (Power = Voltage * Current)
500mA * 5V = 2.5W
900mA * 5V = 4.5W
0
 
LVL 27

Accepted Solution

by:
aburr earned 125 total points
ID: 39235151
For complete details see
-
http://www.ti.com/lit/an/slyt118/slyt118.pdf
-
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Roulette strategy probability question 58 101
Whisker Plot 1 44
Random Variable 2 51
Dual bridge protection 18 111
Foreword (May 2015) This web page has appeared at Google.  It's definitely worth considering! https://www.google.com/about/careers/students/guide-to-technical-development.html How to Know You are Making a Difference at EE In August, 2013, one …
Article by: Nicole
This is a research brief on the potential colonization of humans on Mars.
This is a video describing the growing solar energy use in Utah. This is a topic that greatly interests me and so I decided to produce a video about it.
Although Jacob Bernoulli (1654-1705) has been credited as the creator of "Binomial Distribution Table", Gottfried Leibniz (1646-1716) did his dissertation on the subject in 1666; Leibniz you may recall is the co-inventor of "Calculus" and beat Isaac…

803 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question