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How does the MacBook determine its Magsafe Wattage?

Making up some leads for the DCPS and would like to know does the MacBook determine what wattage magsafe it is using from the magsafe block or from the connector?

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@imicrosoldering - FYI: {http://www.righto.com/2013/06/teardown-a...|Teardown and exploration of Apple's MagSafe connector]

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When you buy a replacement cable from AliExpress they ask you what wattage you need. This won’t be the most reliable of answers to this question you receive, but I think it’s in the connector.

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Chris Stables will be eternally grateful.
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