1
00:00:00,160 --> 00:00:06,080
so imagine this you got a hot date who's hanging onto your every word and she's

2
00:00:04,160 --> 00:00:10,240
asking you what's next on the docket for the evening you bust out your phone to

3
00:00:08,000 --> 00:00:14,960
get directions to an incredibly romantic used video game shop and suddenly you

4
00:00:12,800 --> 00:00:20,080
notice it's deader than your last relationship you start to panic but

5
00:00:17,199 --> 00:00:23,199
suddenly your date pulls out her phone holds it against yours and what you

6
00:00:21,680 --> 00:00:27,920
initially think is some kind of weird courtship ritual but then you see that

7
00:00:25,760 --> 00:00:32,559
your phone is working again thanks to wireless power sharing so you

8
00:00:30,160 --> 00:00:36,320
immediately have two thoughts one she's a keeper and two

9
00:00:34,800 --> 00:00:41,920
how in the heck does wireless power sharing work well we explained the basic principle

10
00:00:39,840 --> 00:00:46,079
behind wireless charging in general in our previous video on distance charging

11
00:00:44,160 --> 00:00:49,840
which you can check out up here but the idea is that when you run a current

12
00:00:47,920 --> 00:00:54,640
through a coil of wire and bring it close to another coil of wire a physical

13
00:00:52,480 --> 00:00:59,680
phenomenon called electromagnetic induction induces a current in the

14
00:00:57,199 --> 00:01:03,600
second coil this is how regular wireless chargers work including the relatively

15
00:01:01,600 --> 00:01:08,720
common qi chargers and even electric toothbrushes but what makes wireless

16
00:01:05,840 --> 00:01:13,200
power sharing different so the biggest difference is that your phone ends up

17
00:01:10,720 --> 00:01:17,520
charging another device directly from its main battery up until now

18
00:01:15,680 --> 00:01:21,520
traditional wireless charging has used a base station that's plugged into a wall

19
00:01:19,280 --> 00:01:26,000
outlet or it's taken the form of a wireless battery bank the advantage to

20
00:01:24,000 --> 00:01:30,159
wireless power sharing is that you don't need any extra equipment like an

21
00:01:27,840 --> 00:01:35,280
external charger or a power bank and the phone itself doesn't even have to be any

22
00:01:32,400 --> 00:01:39,680
larger it simply uses a small induction coil built into the phone's body

23
00:01:37,920 --> 00:01:43,840
currently the most well-known phone that features this technology is the samsung

24
00:01:41,759 --> 00:01:48,720
galaxy s10 which can not only power up the company's galaxy watch and galaxy

25
00:01:46,399 --> 00:01:54,000
buds but also any other phone that supports qi charging now reportedly the

26
00:01:51,520 --> 00:01:58,320
recently launched iphone 11 lineup also contains the hardware to support

27
00:01:56,079 --> 00:02:02,640
wireless power sharing but apple has disabled the feature for now for reasons

28
00:02:00,560 --> 00:02:06,880
that aren't totally clear perhaps the performance wasn't up to scratch

29
00:02:04,719 --> 00:02:11,840
indeed wireless power sharing does come at a rather steep energy cost in a best

30
00:02:09,920 --> 00:02:16,319
case scenario current technology will provide around 500 milliamps of current

31
00:02:14,400 --> 00:02:20,560
which isn't all that much so if you're trying to charge a smartphone with a 3

32
00:02:18,239 --> 00:02:25,760
500 milliamp hour battery that means it would take roughly three and a half

33
00:02:22,319 --> 00:02:28,640
hours just to get the charge up to 50

34
00:02:25,760 --> 00:02:32,879
however the galaxy s10 reportedly loses around one quarter of its battery life

35
00:02:31,120 --> 00:02:37,599
for every hour that it has wireless power sharing enabled so you shouldn't

36
00:02:35,440 --> 00:02:41,760
expect to get anywhere even close to fully charging another phone anyway

37
00:02:40,080 --> 00:02:46,080
wireless power sharing is pretty inefficient in that less than half of

38
00:02:43,760 --> 00:02:50,160
the power used up by one battery will wind up in the other battery so right

39
00:02:48,239 --> 00:02:53,599
now the technology is best suited for quick top-ups when you need a second

40
00:02:51,680 --> 00:02:58,319
phone to just work for a short period of time or if you're charging up less

41
00:02:55,760 --> 00:03:02,640
power-hungry devices like smart watches however as phone battery technology

42
00:03:00,560 --> 00:03:07,200
progresses we may end up seeing more robust wireless power sharing solutions

43
00:03:05,280 --> 00:03:11,360
for now it's a good way to keep you going in a pinch so you can think of it

44
00:03:08,879 --> 00:03:14,400
as like an energy drink for your phone that hopefully won't give it the jitters

45
00:03:12,959 --> 00:03:17,920
half an hour later speaking of half an hour later don't

46
00:03:16,400 --> 00:03:21,760
wait half an hour to check out our sponsor brilliant brilliant provides you

47
00:03:20,159 --> 00:03:26,000
with the frameworks for thinking about and solving problems so you can master

48
00:03:23,519 --> 00:03:30,319
concepts by challenging yourself rather than watching someone else do it a great

49
00:03:28,080 --> 00:03:35,120
education shows you how to solve new and unfamiliar problems by using critical

50
00:03:32,400 --> 00:03:38,959
reasoning skills but you need a toolkit and a framework to work through the

51
00:03:36,480 --> 00:03:42,640
problem so brilliant takes concepts like these breaks them up into bite-sized

52
00:03:40,799 --> 00:03:46,480
chunks and presents clear thinking in each part to build up to an interesting

53
00:03:44,480 --> 00:03:49,680
conclusion and with brilliant you're in the company of over five and a half

54
00:03:48,000 --> 00:03:53,599
million other members who share your curiosity and love for math and science

55
00:03:51,760 --> 00:03:56,480
who can support your learning you build up an emotional connection through

56
00:03:54,879 --> 00:03:59,760
interaction with others which makes it more than just a site for content

57
00:03:57,920 --> 00:04:04,959
consumption so check it out and get inspired go to brilliant.org forward

58
00:04:01,840 --> 00:04:06,640
slash techwiki to get 20 off at the link

59
00:04:04,959 --> 00:04:10,080
below so thanks for watching guys like dislike check out our other videos leave

60
00:04:08,640 --> 00:04:15,519
a comment if you have a suggestion for a future fast as possible and don't forget

61
00:04:12,400 --> 00:04:15,519
to subscribe