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A Non-Toxic Thermoelectric Generator for Wearable Tech - IEEE Spectrum
A new way to harvest electricity from body heat could inspire new wearable devices that never need to be plugged in. The millivolts of electricity this thermoelectric technology produces mandates slim power usage from any electronics plugged in to its feed. The new, wearable thermoelectric generator is also sourced from non-toxic and non-allergenic substances, making it a viable candidate for wearable technology. In fact, says Trisha Andrew, associate professor of chemistry at the University of Massachusetts, Amherst, the substrate on which the generator is built is plain old cotton fabric.
ieee  harvesting  energy  wearables  energyharvesting  wearable  power 
37 minutes ago by cyberchucktx
Leviton’s Wi-Fi Load Center and Smart Circuit Breakers give your home a brain
Is your home ready for a brain transplant? Adding individual smart plugs is quick, easy, and inexpensive, but the benefits are limited to one plug at a time. Leviton‘s new Load Center and Smart Circuit Breakers go deep in your home’s infrastructure, connecting your entire home to the internet and the cloud. Leviton’s intelligent home electrical service was introduced at the 2019 NAHB International Builders’ Show in Las Vegas.
levitron  homeautomation  power  energy  monitoring  breaker 
23 hours ago by cyberchucktx
Why Class Matters
Just to reiterate my main point: real utopias become viable when they span these two strategies, taming and eroding capitalism. That’s why it’s different from old-fashioned Bernsteinian evolutionary socialism. The role of the state in such a transformational project is to defend and expand the spaces in which alternatives are built from below, rather than for the state to provide, to be the central actor in the provision of needs.
class  Marxism  inequality  domination  power  exploitation  Marx  Weber  socialism  anti-capitalism  analyticalMarxism  Althusser  Poulantzas  AlbertMichael  markets  cooperative  utopias  interview  dctagged  dc:contributor=WrightErikOlins 
yesterday by petej
Data Feminism · MIT Press Open
community review site for Data Feminism
power, feminism, bodies
book  power  intersectionality  data 
yesterday by maw
Mac Power Users #470: From Computing to Sheep Farming, with Oogie McGuire - Relay FM
Mac Power Users -

Programmer and sheep farmer Oogie McGuire talks about LambTracker, her application for managing flocks and the hardware that goes along with it, as well as her on-going project of digitizing historical photos.

This episode of Mac Power Users is sponsored by:

Clean My Mac X: The all-in-one package to awesomize your Mac.

Luna Display: The only hardware solution that turns your iPad into a wireless display for your Mac. Use promo code POWER at checkout for 10% off.

TextExpander from Smile: Get 20% off with this link and type more with less effort! Expand short abbreviations into longer bits of text, even fill-ins, with TextExpander from Smile.

Guest Starring:

Oogie McGuire

Links and Show Notes:

Support Mac Power Users with a Relay FM Membership

MPU Talk

LambTracker | Open Source EID for the sheep industry

Oogie McGuire · GitLab

CDC Cyber - Wikipedia

PDP-11 - Wikipedia

nabi Jr. - Tablet For Kindergarten Readiness

OmniFocus - task management for Mac, iPad, and iPhone - The Omni Group

DEVONthink — Smart document management for Mac - DEVONtechnologies

Scrivener | Literature & Latte

National Novel Writing Month

Home | LibreOffice - Free Office Suite - Fun Project - Fantastic People

Scapple | Literature & Latte

Aeon Timeline – Visual Timeline Software

‎Valentina Studio on the Mac App Store

Banktivity is Personal Finance Software for Mac & iOS

YNAB. Personal Budgeting Software for Windows, Mac, iOS and Android

VueScan Scanner Software for Windows, Mac OS X and Linux

Dublin Core Metadata Initiative: DCMI Specifications

Desert Weyr Black Welsh Mountain Sheep

Oogie McGuire (@OogieM) | Twitter
Podcast  Mac  Power  Users 
2 days ago by Frunsman
How do power lines have a high voltage and a low current? | All About Circuits
Actually, you're missing several things, not just one. You've got V=IR, the relationship between voltage, resistance and current right; but you've managed to get yourself thoroughly confused as to which voltage, which current, and which resistance you should be looking at.

Here's the real deal: the amount of current flowing through the transmission wires, times the resistance of those wires, will determine how much voltage is lost along the transmission wires from the generator end to the load end. The higher the resistance, the more voltage will be lost; and likewise, the higher the current, the more voltage will be lost. Now here's the key: the voltage applied by the generator to the transmission line-- that is, the voltage between one conductor of the transmission line and the other conductor-- has absolutely no bearing whatsoever on that calculation. It is completely irrelevant. V=IR determines how much voltage is lost due to that current going through the transmission line's resistance, NOT the voltage applied to the line by whatever is driving it.

For example, suppose I have a hydroelectric generator that delivers 500,000 volts to a transmission line stretching a hundred miles, and that transmission line has a resistance of 10 ohms from one end to the other; and at the far end of the transmission line, the load (a city, for example) has a nominal power demand of 500 megawatts and therefore draws a thousand amperes. 1000 amperes times 10 ohms equals 10,000 volts, which is the voltage lost going down the transmission line from the generator to the load. The generator is delivering 500,000 volts to the line, but only 490,000 volts appears a the other end where the load is.

The problem, of course, is that since power equals voltage times current, that lost voltage represents 10 million watts of wasted energy-- 10,000 volts times 1000 amperes equals 10,000,000 watts. Still, at this high voltage, the transmission system is losing only 2% of the power being pumped into it. Not bad.

Now lets try to send that same 500 megawatts down that exact same transmission line, but at a much lower voltage-- say, 100,000 volts. This time, 5,000 amperes are needed to transmit the same amount of power. What happens to the voltage drop along the transmission line? The line drop is equal to 5000 amps times 10 ohms, or 50,000 volts; and 50,000 volts times 5,000 amps is 250 megawatts. Now, we're losing fully 50% of our power in the transmission line!

And there you have the basic reason why we try to transmit electrical power at the highest voltage practical: it minimizes power loss in the transmission wire.
 
voltage  highvoltage  power  powertransmissions 
3 days ago by vt102

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