Score
Title
547
AskScience Panel of Scientists XVII
414
AskScience AMA Series: I am a squid biologist, AMA!
2913
How do surgeons avoid air bubbles in the bloodstreams after an organ transplant?
6247
Why do joints ache so much when you get the cold/flu?
36
Are all massless particles their own antiparticles?
19
What do prion proteins naturally do in the brain/body?
780
What is the relationship between the rate of change of a function and differentiation?
502
If the energy of photons is continuous, and electron's energy levels around an atom are discreet, then how can you ever have a photon that has the exact energy to be absorbed by an electron?
32
How does coding physically work? How does a computer, made up of inanimate parts, understand what to do based on a made up language?
165
Why do "Y" chromosomes only have 3 chromatids?
9
Does the human body make any noticeable 'microadjustments' when exposed to a particular climate for a length of time?
7
Why do sperm cells have a large nucleus if they only carry half the genetic material?
8
What is thought to happen to quarks during the big rip?
8
How we know certain animals can detect specific scents from X distance away? How are we measuring and determining that?
11068
How do scientists studying antimatter MAKE the antimatter they study if all their tools are composed of regular matter?
3
Are there problems in computer science that no algorithm can solve for all inputs?
1
How do spacelike separated measurements of entangled particles work?
5
Does Urine Affect Plant Transpiration?
1
How do you actually use Density Functional Theory?
205
Can an unvaried diet cause the human body to learn to digest a certain (type of) food faster?
6
Is there a correlation between peoples hearing range and the type of music they like?
60
Why do large metal beams or trusses sometimes have tiny connections/joints?
1
How do you measure forces between individual atoms and molecules?
43
Does Supersymmetry include antimatter?
1
Why do some photos of the heavens show stars radiating light in a 'cross' shape instead of evenly in a circle?
3
I've recently been told that cloning different types of animals varies in difficulty. Is this true and if so what the key challenges in cloning different organisms?
1
Why does Nima Arkani-Hamed say we need an infinitely large apparatus to get rid of quantum uncertainty in measurements?
1
[Engineering] How do modern cars calculate fuel economy?
1
What exactly is the Doppler effect?
6
Why don’t everyday movements cause sub-concussive impacts?
3
Does our mother tongue affect our face features in any way?
1
What is physically different about the brain of someone with an exceptional memory?
29
Why is the waste produced in a thorium fuel cycle need storage for only 300 years instead of thousands of years for uranium fuel cycle, even though U233 from Th232 had mostly similar fission products as U235?
40
How did Scott and Amundsen KNOW when they reached the south pole (100 years ago)?
6
How does convection of heat work in space?
3
[Physics] Has there been significant research relating to anti-matter weaponry?
1
How does a paraconformity originate?
7
Can non ear neurons detect sounds?
990
If 2 black holes were close enough that their event horizons were overlapping, could things in that overlapped region escape those black holes?
4
Is it possible for gravity waves to have a particle nature? If so, what would this particle be like? If not, what sets gravitational waves apart from light and matter, which have particle wave duality?
6
Why is this year's influenza outbreak so much deadlier than previous years?
0
What are fingerprints made of ?
203 [deleted] [removed]
157 Valid_Argument Probably not true for every phone but in general: Charger gives you 5V 1-2A over usb Charging circuit in phone reads battery decides how much current to pull Charging circuit feeds the battery at around 4V because Li-Ion is fully charged around 4ish volts. This brings us to relevant bit number one. The phone doesn't run on 5V 1-2A directly, it runs on the battery, which is less than 5V. To run directly on the 5V input the manufacturer would have needed to plan ahead, which costs money, so most don't. The second point is if you yank out the battery in most phones the charging circuit isn't even connected to the main power, it just runs through the battery typically, so you can't even feed charge to the device without running it through the battery. Third point is retarded charging circuit might say "hey no battery no phone" regardless of if it can run or not. So the answer is it depends. It possible to run right off the charger, but it's cheaper and easier to pass through the battery. A few phones will run with the battery pulled out. Some will run if you take a 4-pin adapter and stick where the battery is supposed to be to connect charge circuit and main power. Some phones probably do this already by having a bypass inside the battery itself, but to be honest manufacturers seem to prefer that your battery die earlier. Maybe the most salient point is that Li-Ion don't like being plugged in all day. Li-Ion batteries are happiest when hovering around 40% charge, in general they suffer the least degradation if they are used from around 30-80%. If longevity is your concern the primary ways to keep your battery are 1) never go below 20%, 2) limit the amount of time spent near full charge, 3) always use the slowest wired charger you have. Basically trickle charging throughout the day. [Here's](https://imgur.com/a/wHg8Q) my Axon 7 after about 1.5 years. 50 hours on battery with light use, still another 25 hours left. I get up to 5 days sometimes.
12 thephantom1492 Should be the power adapter, but may, in some case, use a bit of the battery. A common power circuit is a T. power on the left, battery on the right, load at the bottom. It should in theory take the power from the side with the highest voltage. 5V supply, 3-4.4V battery. The real path is more: adapter -> current sense resistor -> diode -> output <- diode <- current sense resistor <- battery. Bridging the two ends of the current sense resistors, sitting across the output, sit the charging circuit. The diode prevent a direct battery to input and input to battery current path, but allow both to power the load. Take note that it is usually also in parallel with a mosfet, and some circuit to turn on and off the mosfet (the diode first conduct, but lose some voltage. The circuit detect it and turn on the mosfet, which short the diode and basically no voltage is lost, making a 'perfect diode'). The charger then can see the battery voltage and current, and the amount of power used at the input, and control the charge as to not overcharge and not overload the adapter...
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162 0 Valid_Argument Probably not true for every phone but in general: Charger gives you 5V 1-2A over usb Charging circuit in phone reads battery decides how much current to pull Charging circuit feeds the battery at around 4V because Li-Ion is fully charged around 4ish volts. This brings us to relevant bit number one. The phone doesn't run on 5V 1-2A directly, it runs on the battery, which is less than 5V. To run directly on the 5V input the manufacturer would have needed to plan ahead, which costs money, so most don't. The second point is if you yank out the battery in most phones the charging circuit isn't even connected to the main power, it just runs through the battery typically, so you can't even feed charge to the device without running it through the battery. Third point is retarded charging circuit might say "hey no battery no phone" regardless of if it can run or not. So the answer is it depends. It possible to run right off the charger, but it's cheaper and easier to pass through the battery. A few phones will run with the battery pulled out. Some will run if you take a 4-pin adapter and stick where the battery is supposed to be to connect charge circuit and main power. Some phones probably do this already by having a bypass inside the battery itself, but to be honest manufacturers seem to prefer that your battery die earlier. Maybe the most salient point is that Li-Ion don't like being plugged in all day. Li-Ion batteries are happiest when hovering around 40% charge, in general they suffer the least degradation if they are used from around 30-80%. If longevity is your concern the primary ways to keep your battery are 1) never go below 20%, 2) limit the amount of time spent near full charge, 3) always use the slowest wired charger you have. Basically trickle charging throughout the day. [Here's](https://imgur.com/a/wHg8Q) my Axon 7 after about 1.5 years. 50 hours on battery with light use, still another 25 hours left. I get up to 5 days sometimes.
12 0 thephantom1492 Should be the power adapter, but may, in some case, use a bit of the battery. A common power circuit is a T. power on the left, battery on the right, load at the bottom. It should in theory take the power from the side with the highest voltage. 5V supply, 3-4.4V battery. The real path is more: adapter -> current sense resistor -> diode -> output <- diode <- current sense resistor <- battery. Bridging the two ends of the current sense resistors, sitting across the output, sit the charging circuit. The diode prevent a direct battery to input and input to battery current path, but allow both to power the load. Take note that it is usually also in parallel with a mosfet, and some circuit to turn on and off the mosfet (the diode first conduct, but lose some voltage. The circuit detect it and turn on the mosfet, which short the diode and basically no voltage is lost, making a 'perfect diode'). The charger then can see the battery voltage and current, and the amount of power used at the input, and control the charge as to not overcharge and not overload the adapter...
1 0 [deleted] [removed]
1 0 [deleted] [removed]