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65W Power-Adapter for new PB 12"

B

bsmr

macrumors 65816
Original poster
Oct 4, 2005
1,182
317
Germany
I have a 45W Power Adapter and also an 65W Power Adapter. I've read a few threads, but don't know what's right?

Can i use the 65W Power Adapter for my new PB 12" Oct. 2005 Edition? The PB was shipped with a 45W Power Adapter.

I've heard, that the 65W does charge the Book faster - is that right?

will there be any problems in using the 65W Adapter for my new PB12"??

Cheers Buddy
 
Yes you can use the 65W power adapter for the 12" PowerBook (that's the only one you can buy as a spare). I've also got both... I can't say I've ever bothered to observe charging times though.
 
dietcokevanilla said:
Yes you can use the 65W power adapter for the 12" PowerBook (that's the only one you can buy as a spare). I've also got both... I can't say I've ever bothered to observe charging times though.
Click to expand...

Fine - the most important thing for me is that i can use the 65W without damaging my 12" PB
 
buddyspencer said:
Fine - the most important thing for me is that i can use the 65W without damaging my 12" PB
Click to expand...

I'm assuming that you have bought a new one and you're not using some sort of other 65W adapter. It should look exactly the same as the 45W white brick.

Part number of mine is M8943B/A (though that might just be the UK model)

M8943_lm.jpg
 
dietcokevanilla said:
I'm assuming that you have bought a new one and you're not using some sort of other 65W adapter. It should look exactly the same as the 45W white brick.

Part number of mine is M8943B/A (though that might just be the UK model)

M8943_lm.jpg
Click to expand...


i bought a new pb 12" with the 45W Adapter. And also have a new 65W Adapter at home - got it from a friend.

i now compared the 45W with the 65W excatly. the result:

45W Adapter:Output (24V) and 1.875A

65W Adapter: Output(24.5V) and 2.65A


the two adapters have different ampacities and voltings. first i thougth the two adapters only have different watt?!

does the different values also make no odds?
 
buddyspencer said:
i bought a new pb 12" with the 45W Adapter. And also have a new 65W Adapter at home - got it from a friend.

i now compared the 45W with the 65W excatly. the result:

45W Adapter:Output (24V) and 1.875A

65W Adapter: Output(24.5V) and 2.65A


the two adapters have different ampacities and voltings. first i thougth the two adapters only have different watt?!

does the different values also make no odds?
Click to expand...
Firstly it's amperage. Here's a little electronic theory for you:
Ohms law states that volts x amps = watts. Volts ÷ resistance = amps. Resistance x amps = volts.
Generally the voltage isn't that critical. Your powerbook could probably have anywere from 20-30volts running it. The resistance in the circuitry of the adaptor then determines the amps. Amperage times voltage is of course wattage.
I hope that rambling on made some sense :)
 
epepper9 said:
Firstly it's amperage. Here's a little electronic theory for you:
Ohms law states that volts x amps = watts. Volts ÷ resistance = amps. Resistance x amps = volts.
Generally the voltage isn't that critical. Your powerbook could probably have anywere from 20-30volts running it. The resistance in the circuitry of the adaptor then determines the amps. Amperage times voltage is of course wattage.
I hope that rambling on made some sense :)
Click to expand...

Ok - but what about having problems in using the 65W Adapter?? Can i use it without having problems ?
 
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