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just got my mbp and was wondering why it has 2 chargers

utl768

macrumors 6502
Original poster
Sep 8, 2009
385
0
it has the magsafe and then an ac cord

which one should i use?
 

pgiguere1

macrumors 68020
May 28, 2009
2,157
1,082
Montreal, Canada
The cord is just an extension. If you want a longer cord, remove the pins on the power supply like that:



And connect the extension cord instead. Most people I know use the extension, but you may prefer not to use it for more portability. It's just a matter of how long of a cord you need, it makes no difference on charging itself.
 
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utl768

macrumors 6502
Original poster
Sep 8, 2009
385
0
thanks for the responses

first apple laptop so i wasnt sure what was what
 
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Puevlo

macrumors 6502a
Oct 21, 2011
633
1
The cord is just an extension. If you want a longer cord, remove the pins on the power supply like that:

Image

And connect the extension cord instead. Most people I know use the extension, but you may prefer not to use it for more portability. It's just a matter of how long of a cord you need, it makes no difference on charging itself.

Actually the electrons have further to travel which increases the resistance and reduces the efficiency. Over the lifetime of the MBP we are talking hundreds of gigawatts wasted.
 
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Mal

macrumors 603
Jan 6, 2002
6,249
17
Orlando
Actually the electrons have further to travel which increases the resistance and reduces the efficiency. Over the lifetime of the MBP we are talking hundreds of gigawatts wasted.

Hundreds of gigawatts? Absolutely not. Ridiculous hyperbole.

jW
 
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Ledgem

macrumors 68000
Jan 18, 2008
1,894
727
Hawaii, USA
If you'll be using your charger in a public place where other people plug in, please switch the connector out to use the cord. I've been in many libraries where electric outlets couldn't be used because someone had to plug their entire brick into an outlet, covering up the outlet beside it.
 
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pgiguere1

macrumors 68020
May 28, 2009
2,157
1,082
Montreal, Canada
Actually the electrons have further to travel which increases the resistance and reduces the efficiency. Over the lifetime of the MBP we are talking hundreds of gigawatts wasted.

That's terribly exaggerated. Your MBP itself will probably never use a full megawatt during its lifetime. Waste because of the extension is negligible. Charging time is the same.
 
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Interstella5555

macrumors 603
Jun 30, 2008
5,219
12
Actually the electrons have further to travel which increases the resistance and reduces the efficiency. Over the lifetime of the MBP we are talking hundreds of gigawatts wasted.

I bet you're confused about the double rainbow as well...
 
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