Genuine apple macbook charger 60w magsafe a1278

#Genuine apple macbook charger 60w magsafe a1278 full#
#Genuine apple macbook charger 60w magsafe a1278 pro#
#Genuine apple macbook charger 60w magsafe a1278 mac#

If you use a lower rated power supply, in many circumstances it will work ok, it may just charge a little bit slower. The wattage rating is matched up with your particular laptop's needs. If the MagSafe jack is damaged or doesn't have the nameplate chip, the power manager does two things:

#Genuine apple macbook charger 60w magsafe a1278 full#

The longest I've seen was 20+ hours with everything going full blast (full CPU+GPU load, all USB and FireWire ports delivering full rated power, all drives spinning, screen at full brightness, speakers blaring).ДЇinally, the supply's electronic nameplate is stored in the chip residing in the MagSafe jack. With a very high machine load, the charger is left with very little power to use, even with an 85W supply, and will take very long to charge the battery. Since the machine load takes precedence, the power available to the charger will vary depending on the entirety of the machine load: CPU/GPU, drives, USB/FireWire, screen, etc. With an 85W adapter, that leaves about 55W for the machine, and it's insufficient to power a full machine load. The battery charger can consume up to ~30W or so. The rate at which the battery charges will also depend on the machine load. If you have both cores going full-throttle, the battery will be always discharging until it reaches a zero charge state. This means that with a 60W charger, the battery will charge only during light CPU load. Since the machine load takes priority and doesn't shed until there's insufficient power available, the battery will be always discharging whenever the supply can't provide sufficient power to cover the machine's needs. That's why the performance will be poor with an inadequate power supply. So the latter will be throttled to maintain the power balance. The 60W supply, even if connected to a 17 inch MBP, will satisfy all internal and external loads (USB, FW, drives, screen), except for the CPU and GPU. The CPU load shedding will, by design, always manage to balance the power. If there isn't enough power for the machine, the load shedding kicks in and throttles the CPU (and perhaps GPU - I don't recall offhand). Conversely, a fully charged battery will demand a zero charger load, and that's fine. If there isn't enough power left for the charger, the battery is by definition discharging unless it has no charge left. Thus, given an available input power, the machine load is satisfied first, and any leftover power is provided to the battery charger. The power management system also knows the electronic nameplate of the power supply and thus its rated power.

The loads are prioritized: the machine has priority over the battery charger. The power management must maintain the following inequality balanced, in terms of power: (power adapter + battery as a power source) >= (battery charger + the machine). The battery as a power source is exclusive of the battery charger: a battery may operate as a power source, or the battery charger may operate, but never both at once.

the machine (logic, drives, memory, screen, speakers, USB devices, etc.)Д«oth loads are adjustable and the power management's function is to adjust them as needed.

The below explains why.ДЄ MacBook's power management works very simply: it maintains a balance of power between the power consumed by the loads and the power available from the sources. It will operate safely, but the CPU performance will be diminshed. The MacBook it's plugged into won't operate in a 'brownout'. It will clearly run at full capacity for longer than a higher wattage adapter or even fail to keep up with the energy demands of a machine using more than 60w giving you a flat battery if you run a deficit of energy вЂњwhile chargingвЂќ. So no, a 60W adapter won't overheat when connected to a machine that needs an 85W adapter. This is a given for the systems to receive safety certifications.

I will give some facts along with my reasoning.ДЄll MagSafe adapters, when plugged into a mechanically matching receptacle on a MacBook/MacBook Pro, are designed to run safely. Not original Adapter,this is replacement.There is a lot of misinformation in some answers.

#Genuine apple macbook charger 60w magsafe a1278 pro#

Note: Not Fit Latest Macbook Air or Pro Issued After JUNE, 2012, different dc size,plz confirm first and then purchase.

#Genuine apple macbook charger 60w magsafe a1278 mac#

If the item is not your need,you can find other ac adapter charger for macbook pro below,you can also contact usД¤5W Magsafe Power Adapter 45W Magsafe 2 Power Adapter 60W Magsafe Power Adapter 60W Magsafe 2 Power Adapter 85W Magsafe Power Adapter 85W Magsafe 2 Power AdapterДЄ1181/A1184/A1278/A1330 / MA538LL/A / MA538LL/B / 661-4269 / 661-4485 / 661-3957ДЄpple Mac Book: MA254LL/A, MA255LL/A, MA472LL/A, MA699LL/A, MA700LL/A, MA701LL/A, MB061LL/B, MB062LL/B,Д¬ore Duo, Late 2006 Core 2 Duo, Late 2007, Mid 2007 Core 2 Duo, 13.3-inch, Black Santa Rosa, White SantaД¦0W Magsafe Power Adapter Compatible List: