Um. 4400 mAh is just a self promoting way to say 4.4 amp hour.
And with a 3.7 volt lithium ion cell that works out to be 16.3 watt hours. But that doesn’t sound that impressive.
Electricity
Your Electric Servant | Lemelson Center for the Study of Invention and Innovation
EEVblog 1417 – Alternating Current AC Basics – Part 1
This series is a good in depth look at Alternating Current today.
Inside a new Philips ultra-efficient LED lamp (with schematic)
So, What Exactly Is Building Electrification? | Greentech Media
Buildings were first electrified nearly 150 years ago. So, why is it that “building electrification” is now among the energy industry’s most popular buzzwords?
Most buildings run on multiple fuels. They use electricity to power lights, refrigerators and electronic devices. And they consume fossil fuels such as natural gas or propane to power furnaces, boilers and water heaters.
That persistent reliance on fossil fuels makes buildings one of the largest sources of planet-warming pollution. In the United States, buildings account for roughly 40 percent of the country’s energy use and greenhouse gas emissions, and nearly half of all homes rely on natural gas as their primary heating fuel.
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Isolation transformers are wonderful things when working with high voltage devices with the case open and power on, like when trying to find a blown capacitor in a television. Greatly reduces your chances of dying should you touch the hot side of things, as hot isn’t referenced to ground – only the neutral on the transformer.
If you don’t put both hands on the device, and there is no path through your heart from hot to neutral, chances are good that you live, although you could still get burned on a hand if it’s a path between hot and nuetral in your device.