|
04-12-2016, 08:51 PM
|
#1
|
Senior Member
Outdoors RV Owners Club
Join Date: Dec 2014
Location: NorthEastern Oregon
Posts: 1,111
|
Charging Cell Phone on 2 amps?
Amps and watts and electricity in general is greek to me. I recently installed some 12v USB charging ports in my TT. Each outlet that I installed has a 1 amp and a 2 amp USB port. I know that the charger on my cell phone is rated 1 amp, so I'm wondering if it is bad to charge it on a 2 amp port? Or is it ok and it will just charge faster? My tablet charger is rated 2 amp so I can use that port for the tablet but I'm wondering what damage might occur if someone accidentally plugs a cell phone in there.
__________________
2013 Wind River 280RLS, 200W Solar
2013 Ram 2500 Laramie Cummins 4x4
|
|
|
|
Join the #1 RV Forum Today - It's Totally Free!
iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!
You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!
|
04-12-2016, 09:11 PM
|
#2
|
Senior Member
Join Date: Jan 2016
Posts: 625
|
Quote:
Originally Posted by fisher99
Amps and watts and electricity in general is greek to me. I recently installed some 12v USB charging ports in my TT. Each outlet that I installed has a 1 amp and a 2 amp USB port. I know that the charger on my cell phone is rated 1 amp, so I'm wondering if it is bad to charge it on a 2 amp port? Or is it ok and it will just charge faster? My tablet charger is rated 2 amp so I can use that port for the tablet but I'm wondering what damage might occur if someone accidentally plugs a cell phone in there.
|
It's easier than you think.
Look at it this way: What you plug into the port is a "load". The port itself can support a load of anything up to the rating of the port. So you can plug a 1 amp device into a 1 amp port, or you can plug it into a 2 amp port, or (if it had one) you could plug it into a 72 amp port. (Ok, that's an exaggeration)
You run into trouble when you connect a load that demands more than the port can deliver, such as plugging a 2 amp device into a 1 amp port. This potentially can cause problems such as blown power supplies or dangerous overheating.
Does that make sense?
Roger
__________________
TV 2010 Ford F-150 Supercab
TT 2016 Jay Feather 23RLSW
|
|
|
04-12-2016, 09:18 PM
|
#3
|
Senior Member
Outdoors RV Owners Club
Join Date: Dec 2014
Location: NorthEastern Oregon
Posts: 1,111
|
Quote:
Originally Posted by rkresge
It's easier than you think.
Look at it this way: What you plug into the port is a "load". The port itself can support a load of anything up to the rating of the port. So you can plug a 1 amp device into a 1 amp port, or you can plug it into a 2 amp port, or (if it had one) you could plug it into a 72 amp port. (Ok, that's an exaggeration)
You run into trouble when you connect a load that demands more than the port can deliver, such as plugging a 2 amp device into a 1 amp port. This potentially can cause problems such as blown power supplies or dangerous overheating.
Does that make sense?
Roger
|
Yes, that actually does make sense. Even to me! So my concern was actually backwards. No problem plugging a 1 amp cell phone into the 2 amp port, but probably best not to plug my 2 amp tablet into the 1 amp port. Very interesting, and MUCH appreciated!
__________________
2013 Wind River 280RLS, 200W Solar
2013 Ram 2500 Laramie Cummins 4x4
|
|
|
04-13-2016, 12:02 PM
|
#4
|
Senior Member
Newmar Owners Club
Join Date: Jan 2015
Posts: 358
|
Quote:
Originally Posted by rkresge
It's easier than you think.
Look at it this way: What you plug into the port is a "load". The port itself can support a load of anything up to the rating of the port. So you can plug a 1 amp device into a 1 amp port, or you can plug it into a 2 amp port, or (if it had one) you could plug it into a 72 amp port. (Ok, that's an exaggeration)
You run into trouble when you connect a load that demands more than the port can deliver, such as plugging a 2 amp device into a 1 amp port. This potentially can cause problems such as blown power supplies or dangerous overheating.
Does that make sense?
Roger
|
I agree with your logic when it applies to normal electrical circuits. If you plug in an appliance that draws 20 amps on a 15 amp circuit you'll blow the breaker. For USB, however, that will not be the case. There is internal circuitry to only deliver the maximum current available. That means you can safely plug in a tablet that "wants" 2 amps into a circuit only able to deliver 1 amp. You just charge slower. For example, that is effectively what happens almost every time you connect your tablet to a computer.
__________________
Ron & Mary
2019 Newmar London Aire 4543
2014 Honda CR-V
|
|
|
04-14-2016, 11:36 AM
|
#5
|
Senior Member
Outdoors RV Owners Club
Join Date: Dec 2014
Location: NorthEastern Oregon
Posts: 1,111
|
Thanks, gentlemen, for the replies. It's no wonder this electrical stuff is confusing to me...
__________________
2013 Wind River 280RLS, 200W Solar
2013 Ram 2500 Laramie Cummins 4x4
|
|
|
04-14-2016, 08:08 PM
|
#6
|
Senior Member
Join Date: Jul 2011
Posts: 2,303
|
And it just got more confusing with Quick Charge 2.0 and 3.0 available on newer phones... the charger and phone negotiate a voltage (up to 12 volts, to pass more current on skinny charging cables) that changes as the charge progresses. Up to 25 watts, works great, flat to full charge in 30-45 min!
These aren't your father's chargers
|
|
|
|
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
|
|
Thread Tools |
Search this Thread |
|
|
Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
» Recent Discussions |
|
|
|
|
|
|
|
|
|
|
|
|
|