Welcome to this read-only archive of the Worknets wiki. Our content is in the Public Domain. We were active at this and previous wikis from November, 2004 to July, 2010. Please join us at the sites below where we are now active!Tweet
Andrius Kulikauskas Self Learners Network. Think Through Art with Andrius Kulikauskas. Directory of ways of figuring things out. Chicago Street Artist Blog. Video summary of knowledge of everything. Notes on Gamestorming. Living by Truth working group. Twitter: @selflearners Email: ms @ ms.lt
Edward Cherlin Earth Treasury
Kennedy Owino Nafsi Afrika Acrobats
Ben de Vries
Samwel Kongere Mendenyo
George Christian Jeyaraj
Lucas Gonzalez Santa Cruz
Christine Ax, Steve Bonzak, James Ferguson, Maria Agnese Giraudo, Marcin Jakubowski, Ed Jonas, Rick Nelson, Hannington Onyango, Linas Plankis, Proscoviour Vunyiwa
Andrius helped with the following websites:
See also: FlashDriveEditor, Hardware, Power, MathEncyclopedia, Electricity
Ricardo's concept The power could come from rechargeable batteries, either in an internal compartment or an external box. The OLPC project has a range of power options we could use. This page has a lot of conventional and speculative ideas by various people http://wiki.laptop.org/go/Battery_and_power .
Network for Recharging Batteries
One option is to organize people like a Sneakernet, to take batteries to a place with mains electricity for re-charging, even if the battery has to pass down a chain of 10 people to get there and back. I think I said on Worknets that in the early days of radio in the 1930s, people took batteries to their local electrical store for re-charging. People had 2 batteries, one to use and one at the store being re-charged.
I've added a Paid Battery-Delivery Service to KnowledgeWork, as one way to earn some extra income and provide a useful service.
A 1/8 VGA Kent display requires .022 Joules for each screen refresh. How many screen refreshes (or keystrokes) can it allow for with 3 AA batteries?
If the 1/8 VGA Kent display is used for typing 60 words per minute, where each word is an average of 5 characters, then there are 5 refreshes per second, which is .11 Joules per second, which is .11 watts. A VGA display would be less than 1 watt even with continuous typing.
The total power used by the FlashDriveEditor would be:
OneLaptopPerChild laptop will consume about 2 W of power during normal use, compared with 10 to 45 W for conventional laptops.
It says that if you have a back-up petrol/diesel generator, you may only need it for 50 to 200 hours per year.
It also says, in section 6 'Battery Bank', that systems that are used just to deal with power-outages/cuts can use ordinary car-batteries, as the batteries are fully charged most of the time. However, systems that work on their own need 'Deep-Cycle' or 'Deep-Discharge' batteries, that often go from fully charged down to almost fully discharged. These will be more expensive and difficult to obtain in developing countries.
The One Laptop Per Child Wiki page at http://wiki.laptop.org/go/Battery_and_power explains why Deep-Discharge batteries are needed. The plates on ordinary car-batteries are thin and sensitive to deep discharge. They experience 'premature end of life' if discharged below 10 Volts.