I could be totally wrong about my understanding but I think phones and other devices “pull” the electricity needed to charge their batteries and if you plugged it into a wall plug that couldn’t supply enough juice it could damage the phone. I also hear people talk about some wall plugs charge their phone way faster so my question is can phones or other devices modulate how much they pull if they detect that a plug is capable of supplying more? Enlighten me people of the internet’s!
In: 1
Most phones have a USB connector. There’s a written standard for how that works for charging. The phone detects a voltage and says “hey, im connected to something. Wonder if it’s a good source of energy, or maybe it wants to give me data or something!” Then the phone and the charger send short bursts of voltage back and forth to each other, signalling like
“Hey can I pull energy from you?”
“YES”
“Can I have this much?”
“YES”
“Can I have *this* much?”
“YES”
“Can I have ***THIS*** much??”
“**NO**”.
“OK!”
Latest Answers