How does charging a phone with a 9V battery car charger and a quarter work?

Subject: How does charging a phone with a 9V battery car charger and a quarter work?

Date: Wed Sep 30 22:39:10 2015
Posted by Minerva
Grade level: undergrad School: No school entered.
City: No city entered. State/Province: No state entered. Country: No country entered.
Area of science: Other
ID: 1443677950.Ot

Message:


So I've seen a couple of "life hacks" about emergency charging of a phone. 
Apparently, you can use a 9 volt battery to charge it. You just need a car 
charger (to put on the positive end), a quarter, key, or piece of metal (to 
put on the negative end but it should be touching the car charger too?), and 
then plug it into the phone.

I'm very curious as to how this works, if you could give me every single 
detail too.

Re: How does charging a phone with a 9V battery car charger and a quarter work?

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