Tagged Questions
15
votes
1answer
419 views
Does this device which claims to reduce reactive energy from a house work?
I've opened a device that states that it can reduce the reactive energy from a house, by plugin it directly to the power outlet/wall socket. I think it is a con, so I've opened it and I saw this black ...
3
votes
1answer
99 views
Kilowatt Hour Definition
This is a very simple question but something that I'm not able to wrap my head around. This Energy report states generated electricity. But what does "generated killowatthours" mean? I know that ...
3
votes
1answer
86 views
ARD00280 Microchip Energy Reference Schematic Live and Neutral Swapped?
Looking at the Microchip Energy Chip reference design
I noticed that the power is being sampled from neutral. My first reaction to this was this is backwards, that the power should be sampled from ...
1
vote
1answer
94 views
Power and energy measurment for embedded system -help needed
I am trying to measure the power consumption of a low power embedded system. As the embedded system consumes current in random pulses from the battery pack, I am using an oscilloscope to analyze the ...
3
votes
3answers
175 views
Energy conversion from Electrical to Mechanical
I have a requirement where I have to design a very small device capable of pulling in and out a small piston through a feedback.I know it can be done using motor but AFAIK I need higher voltage and ...
4
votes
2answers
1k views
How to compare mAh and Wh
When looking at consumer electronic devices with batteries I sometimes see the battery capacity listed in Wh (watt hours) and sometimes in mAh (milliamp hours). I would like to be able to compare the ...
0
votes
1answer
286 views
How could a charger “cut out” when charging is complete? [duplicate]
Possible Duplicate:
Why is it so problematic to have close to zero standby power consumption?
How would you detect vampire/standby power?
This article discusses why cell phone users have ...
12
votes
3answers
4k views
Why are deep cycle batteries rated in amp hours instead of watts hours?
Why are deep cycle batteries rated in amp-hours instead of watt-hours? For example if I see a 85Ah battery, I multiply 85Ah x 12V to get 1020 watts. As household electricity use is measured in watt ...
2
votes
4answers
337 views
Alternator with torque proportional to angular velocity
Im interested in buying or designing an alternator/electrical generator that increases torque as rpms increase - is there an alternator design that increases resistance as rpm/angular velocity ...
5
votes
4answers
201 views
Measuring total energy used by a project
Is there a cheap/simple way I can empirically measure the total energy used by my project over a sample time of several minutes?
It's a microcontroller based system which repeatedly wakes up, does ...
3
votes
3answers
199 views
Temperature vs AC energy consumption
I'm working on a project about electricity pricing, and need to understand the following: to keep the room at confortable temperature (70 degree, for example), does the amount of energy consumed by ...
15
votes
5answers
727 views
Why is it so problematic to have close to zero standby power consumption?
Each electronic device consumes electric power when it is "idle" unless it has a mechanical switch. I can understand that for example a TV with a remote control needs to "be ready" to receive a ...
