Why your laptop charger is so hot

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Home Computers & Laptops Why your laptop charger is so hot
Published on March 30, 2016

Turns out, Nikola Tesla is partly to blame. Liz Scheltens explains, with a little help from NPR’s Planet Money. Subscribe to their awesome podcast here: http://n.pr/1RZaOeT

  1. How can we recylce the wasted energy that turns to heat?

  2. I love how the narrator actin' like she knows how electricity works, not to consider the modern day electricity consumption, do you really wanna build a DC power plant every 2 miles? because that's how far a direct current can travel.
    Okay we could have a giant rectifier box at each household, but where is its power convertin' from? back to AC again! and do you want to build a coal power plant at each neighborhood now? I think not. Some people might say: "oh lets build a wind power system and bloom boxes in our backyard or a solar power system on our roof, so we can have DC power hardwired to our house holds!" don't be naive, these setups are not constant energy supply, and not to mention amount of money you're gonna invest in these systems.
    The only sustainable and affordable energy supply that can travel far distance is Nikola Tesla's Alternating Current, and hes the only one who pushes mankind forward to a modern day electric society, with out him, 99% of the population would have lung cancer by the rate of modern day energy consumption, and you attempt to pull us backwards? how stupid are you? And NO! we're not gonna breath in more CO2 than already it is because of your stupid little Apple rectifier that heats up every time you charge! so please educate yourself before you open your mouth again.

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  3. Both of their voices sound like their either have a Starbucks straw in their mouth or a veiny cock. Either way they sound basic as fuck

  4. drkmgic

    seriously just surfing your videos.

  5. jesus her voice is scratchy

  6. While you are right about Tesla and Edison, It was Westinghouse who was the big muscle in the fight against Edison and DC.
    Tesla was the Brains, and Westinghouse had the power and money.

  7. is this where the name AC⚡️DC comes from?

  8. seriously this was explained in school when i was 12 who tf didnt know this

  9. The thing you missed is that you have to turn your charger according to the + and – if you want to use DC. AC is alternating therefore it doesnt matter which way you turn it.

  10. Eventually it turned into AC/DC

  11. plus, laptop batteries can only store dc

  12. I Lought out Loud after hearing. " The Us has one of the best most Reliable Powergrid in the World"

  13. An interesting idea, this whole-house DC converter. With new standards like USB-C (which provides enough power to charge a laptop, or anything smaller like a cell-phone) it might be practical in a few years. We just have to get all the manufacturers to all play along, which will be difficult. I've often wished I could simply plug directly into a DC power source, and avoid having dozens of "wall warts" all over my house. Perhaps in a decade or so, after USB-C has really taken off (assuming it does) someone could implement this whole-house DC converter unit. Looking forward to seeing what the free market will bring in the future.

  14. m3nster

    Can we have an entire video on how Nikolai Tesla was screwed over by Edison

  15. Peter

    waaaait a Minute… AC does actually not work (realy) fine for LED Light Bulbs^^ and anyway isn't the most energy lost because of the Voltage difference?
    U just need 4 Diodes and a Condensator to convert AC to DC… Correct me if I am wrong^^

  16. Having a high power ac-dc converter for the whole builing or the whole grid would make it worst simply because not every dc device work at the same voltage so you would need another dc-dc converter anyway which increase the wasted energy in conversion

  17. Is Vox about talking about topics that they just learned about and then made a video? It's like these videos are specifically made for children in Grade 6.
    And that image of a light bulb was an LED bulb which had a DC converted inside. I'm sure there's enough images of old incandescent bulbs out there you guys could have used.

  18. nj0shi

    I don't think that is a good idea, the electricity consumed by electronics is much less compared to the electricity consumed by electric devices. Also AC is very efficient when it's transported long distances. What we should be looking into is improving the efficiency of a AC to DC convertor.

  19. Zippo

    Are you kidding me is this for elementary school or just lazy?

  20. So that's why AC/DC has a lightning bolt as the slash…

  21. an easier way would be to just reduce the amount of devices you use that rely on DC energy — that way you wont need to convert.

  22. I use it as a foot warmer in the winter.

  23. iiTrxcy

    I have never found my laptop charger attractive

  24. She doesn't get into the details at all.
    Converting AC to DC (or the other way around) can be done very efficiently, and the converter won't get hot because very little power is lost in the conversion.
    Thing is, consumer electronics are specifically designed to be as inexpensive as possible, but still do the job. So, the power converter is built with lower-than-possible efficiency, because it keeps the cost of the device to an absolute minimum, but the converter wastes energy by dissipating it in the form of heat.
    Computers, phones, radio & TV sets, etc.–all of these electronic devices only run on DC power, and if they use batteries for portable power, the battery also only works with DC, so a converter is a must–but it must be built in line with the cost of the device. Nobody wants to spend $250 for a charger for a $400 laptop!
    AC power is used by the main grid because it's easier to produce at the power station and easier to efficiently convert to different voltages for distribution without having to use converters with expensive electronics or moving, mechanical parts that require maintenance, and that's why every building is supplied with AC power–if you want DC to power an electronic device, the power is converted to DC electronically, usually by the device itself or its own charger.

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