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Power adapters for Mac notebooks are available in 29W, 30W, 45W, 60W, 61W, 85W, 87W, and 96W varieties. You should use the appropriate wattage power adapter for your Mac notebook. You can use a compatible higher wattage power adapter without issue, but it won't make your computer charge faster or operate differently. If you use a power adapter that is lower in wattage than the adapter that came with your Mac, it won't provide enough power to your computer.
Mac notebooks that charge via USB-C come with an Apple USB-C Power Adapter with detachable AC plug (or 'duckhead'), and a USB-C Charge Cable.
Mac notebooks that charge via MagSafe come with an AC adapter with MagSafe connector and detachable AC plug, and an AC cable.
The images below show the style of adapter that comes with each MacBook, MacBook Pro, and MacBook Air. If you're not sure which model Mac you have, use these articles:
Apple 29W or 30W USB-C Power Adapter and USB-C Charge Cable
Apple 30W USB-C Power Adapter and USB-C Charge Cable
Apple 61W USB-C Power Adapter and USB-C Charge Cable
Apple 87W USB-C Power Adapter and USB-C Charge Cable
Apple 96W USB-C Power Adapter and USB-C Charge Cable
For the best charging experience, you should use the USB-C charge cable that comes with your Mac notebook. If you use a higher wattage USB-C cable, your Mac will still charge normally. USB-C cables rated for 29W or 30W will work with any USB-C power adapter, but won't provide enough power when connected to a power adapter that is more than 61W, such as the 96W USB-C Power Adapter.
You can verify that you're using the correct version of the Apple USB-C Charge Cable with your Mac notebook and its USB-C AC Adapter. The cable's serial number is printed on its external housing, next to the words 'Designed by Apple in California. Assembled in China.'
85W MagSafe power adapter with MagSafe 2 style connector
60W MagSafe power adapter with MagSafe 2 style connector
45W MagSafe power adapter with MagSafe 2 style connector
If you have an older MagSafe adapter, you can use it with newer Mac computers that have MagSafe 2 ports using a MagSafe to MagSafe 2 Converter (shown).
60W MagSafe power adapter with 'T' style connector
60W MagSafe power adapter with 'L' style connector
85W MagSafe power adapter with 'T' style connector
85W MagSafe power adapter with 'L' style connector
45W MagSafe power adapter with 'L' style connector
* Adapters that shipped with the MacBook Air (Original), MacBook Air (Late 2008), and MacBook Air (Mid 2009) are not recommended for use with MacBook Air (Late 2010) models. When possible, use your computer's original adapter or a newer adapter.
You can get extra or replacement adapters with AC cord and plug at the Apple Online Store, an Apple Reseller, or an Apple Store.
A replacement adapter might not be the same size, color, shape, or wattage as the original adapter that came with your computer. But it should power and charge your Mac like the adapter that originally came with your computer.
If you need help using your MagSafe adapter, see Apple Portables: Troubleshooting power adapters.
If you're looking for a PowerPC-based power adapter, see PowerPC-based Apple Portables: Identifying the right power adapter and power cord.
I've determined power usage on my desktop and on my server, but I hadn't gotten around to testing the power usage of my laptop. As battery life is always a concern with a laptop, I was particularly curious to see which parts of the laptop draw the most power. So I ran a few tests with my trusty kill-a-watt on my Dell Inspiron 300m. It's an ultaportable 2 pound laptop of late 2003 vintage with the following specs:
Let's start with some baselines:
Laptop off, battery charging | 63w |
Laptop off, battery disconnected | 1w |
Laptop off, sleeping | 1w |
Laptop on, idle at Windows desktop | 15w |
All subsequent tests were run with the laptop connected to AC power and the battery physically removed from the machine.
How much power does the LCD display use?
maximum screen brightness | 15w |
minimum screen brightness | 11w |
How much power does the hard drive use?
hard drive sleeping | 14w |
hard drive idle | 15w |
hard drive defragmenting | 18w |
How much power does the onboard WiFi use?
wifi disabled | 15w |
wifi enabled | 16w |
wifi bandwidth test | 19w |
How much power does the CPU use?
cpu idle | 15w |
cpu running prime95 torture test | 26w |
How much power does the integrated video use?
Running 3dMark2001 produced a peak power usage of 29 watts. We can subtract the Prime95 number of 26 watts -- which is entirely CPU-only-- to estimate about three watts are used exclusively by the integrated Intel 'extreme'* video hardware.
Bear in mind the kill-a-watt is only accurate to plus or minus a watt. And these are all rough figures based on a sample size of one laptop. But I think the rules here can be generalized to most laptops.
Here's what I learned:
Of course, your mileage may vary.
* it's extreme, all right. Extremely crappy.