U.S. CitiesCity-Data Forum Index
Go Back   City-Data Forum > General Forums > Science and Technology > Consumer Electronics
 [Register]
Please register to participate in our discussions with 2 million other members - it's free and quick! Some forums can only be seen by registered members. After you create your account, you'll be able to customize options and access all our 15,000 new posts/day with fewer ads.
View detailed profile (Advanced) or search
site with Google Custom Search

Search Forums  (Advanced)
Reply Start New Thread
 
Old 12-06-2016, 05:54 PM
 
Location: SF Bay Area
13,343 posts, read 17,784,147 times
Reputation: 19664

Advertisements

Ummm ... is there such a thing as a 200-watt USB heater?
Reply With Quote Quick reply to this message

 
Old 12-06-2016, 09:54 PM
 
1,080 posts, read 830,588 times
Reputation: 627
pops popcorn while there pc melts

they used to make a ciarette lighter for your pc but i wouldn't even trust that with the power draw

http://www.frozencpu.com/cig-01.html
Reply With Quote Quick reply to this message
 
Old 12-07-2016, 07:23 AM
 
2,906 posts, read 1,708,175 times
Reputation: 2988
Keep in mind the difference between the maximum spec for something (here, the USB port) and the specs in a particular configuration. Kinda like a 110v power converter rated for 50 watts. The plug may be good for 15 amps and 1650 watts overall, but the converter isn't.

I know of no USB port on an actual machine spec'd for the voltage or amperage to get even close to 200W. Too much risk of damage on both ends. No PC board trace could handle that current. Even a jumper would need to be pretty robust. And where's the demand? Not anywhere you have a 110V outlet. Away from an outlet, on a notebook? For a minute or two (maybe 15 min with a large laptop battery) until the battery is dead.

Let's use some common sense here.
Reply With Quote Quick reply to this message
 
Old 12-08-2016, 08:28 PM
 
Location: (six-cent-dix-sept)
4,915 posts, read 2,509,651 times
Reputation: 3152
watts measure power.
warmth is measured in kelvin (or fehrenheit).
Reply With Quote Quick reply to this message
 
Old 12-09-2016, 07:39 AM
 
2,906 posts, read 1,708,175 times
Reputation: 2988
^ actually, temperature is measured in Kelvin, Centigrade or Fahrenheit. Warmth, or more properly heat, is measured in BTU or Joules. Heat transfer is measured in Watts, which is one Joule per second.

Simple, no?
Reply With Quote Quick reply to this message
 
Old 12-09-2016, 01:10 PM
 
Location: (six-cent-dix-sept)
4,915 posts, read 2,509,651 times
Reputation: 3152
^ (standing applause).
Reply With Quote Quick reply to this message
 
Old 12-11-2016, 10:05 AM
 
Location: Hiding from Antifa?
6,683 posts, read 4,368,756 times
Reputation: 6038
Quote:
Originally Posted by Hemlock140 View Post
Placebo effect. At my office, personal heaters that plug into AC are not allowed. If too cold, your only choice is the USB heater lap blanket. They are useless, according to those that tried them. While I find it a bit too warm at the setting of 70 they keep it at, others are working in coats. When you have 3 floors with 400 people there is no way to make everyone comfortable.
It's the time of year again. Slip another lump of coal into the stove while Scrooge is looking the other way.
Reply With Quote Quick reply to this message
 
Old 12-11-2016, 10:34 AM
 
10,169 posts, read 10,499,754 times
Reputation: 5450
Quote:
Originally Posted by harry chickpea View Post
IDIOTIC 200 watts through a USB connector is like someone saying you can pee at firehose strength through your dick.
I think you are exaggerating a little. The 100W power delivery has been a goal for many years and was finally reached in 2014. The Apple MacBook has only one port that delivers both data and power at 100W which is sufficient to power the computer.

USB power standards
5 Volt
Specification Current Power
Low-power device 100 mA 0.50W
Low-power SuperSpeed (USB 3.0) device 150 mA 0.75W
High-power device 500 mA 2.5W
High-power SuperSpeed (USB 3.0) device 900 mA 4.5 W
Battery Charging (BC) 1.2 5A 25W
Type-C 1.5A 7.5 W
3A 15 W

20 Volt
Power Delivery micro-format 3 A 60 W
Power Delivery standard format or Type-C 5 A 100 W

Blankets that plug into USB ports.
http://image.rakuten.co.jp/trend-mar...loa00-0031.jpg

I think the 200W heater was mislabeled, and in fact requires a standard wall outlet, but 100W is within reason.
Reply With Quote Quick reply to this message
 
Old 12-11-2016, 11:27 AM
 
Location: Somewhere in northern Alabama
18,567 posts, read 55,502,062 times
Reputation: 32361
Put 200 watts through a 100 watt fuse and see what happens.
Run a circuit that nominally uses 100 watts on a 100 watt fuse and see what happens.
I do have to admit I've stood next to guys that peed like horses (how the F*** do they do that? Did they replace their prostate with a gate valve?), but I don't think they had the stream of a firehose.
Reply With Quote Quick reply to this message
 
Old 12-11-2016, 02:25 PM
 
40,292 posts, read 41,843,525 times
Reputation: 16805
Quote:
Originally Posted by harry chickpea View Post
I do have to admit I've stood next to guys that peed like horses (how the F*** do they do that? Did they replace their prostate with a gate valve?), but I don't think they had the stream of a firehose.
If I've had a few beers I sometimes amaze myself when I wake up in the morning. "When will it end...."
Reply With Quote Quick reply to this message
Please register to post and access all features of our very popular forum. It is free and quick. Over $68,000 in prizes has already been given out to active posters on our forum. Additional giveaways are planned.

Detailed information about all U.S. cities, counties, and zip codes on our site: City-data.com.


Reply
Please update this thread with any new information or opinions. This open thread is still read by thousands of people, so we encourage all additional points of view.

Quick Reply
Message:

Over $104,000 in prizes was already given out to active posters on our forum and additional giveaways are planned!

Go Back   City-Data Forum > General Forums > Science and Technology > Consumer Electronics
Similar Threads
Follow City-Data.com founder on our Forum or

All times are GMT -6. The time now is 03:51 AM.

© 2005-2019, Advameg, Inc. · Please obey Forum Rules · Terms of Use and Privacy Policy · Bug Bounty

City-Data.com - Archive 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35 - Top