The heat released from your iPhone's charging battery paired with that produced by the charging coils can raise the temperature. If this heat has nowhere to go, it can cause overheating. An overheating MagSafe charger will feel unusually warm, and you may not be able to hold it when charging.
The heating is because of a weakened electrical connection. When electricity is forced to go through a dirty connection , or through wires that are too small, it heats those things up. With a sufficiently dirty, damaged, or loose connection, it will spark through the dirt or the air gap.
It is normal that a power adaptor generate heat. But if you think it becomes too hot, I suggest you contact Apple. As for a replacement, they will tell you. Don't compare with lightbulbs: the Apple chargers and macs are programmed to do what it should, nothing more nothing less, protected.
The charging current tapers off sharply as full charge approaches. If your adapter "brick" is resting on a soft surface like upholstery, bedclothes or a carpet, it will heat up more than normally because air can't circulate freely around it. Rest it on a hard flat surface, just like the MBP itself.
Chargers take power voltage from the wall and convert it to be fed into your device. The wall power voltage may be around 100-120 volts while the device voltage is 5 volts, so your charger has to convert and release some of this voltage which can result in heat.
When you're using your MacBook or charging the battery, it's normal for the bottom of the case to get warm. For prolonged use, place your MacBook on a flat, stable surface. Do not place your MacBook on your lap or other body surface for extended periods of time.
It transforms the voltage coming from the wall socket into the ideal amount of voltage required for your computer, usually from the 120 volts coming from the outlet to between eight and 16 volts needed for the computer. This process causes the plug to heat up, which results in a charger that feels warm to the touch.
Why Does My MacBook Get So Hot? Your MacBook is a highly functional Mac machine and being such a complex computer, it has a lot of intricate parts that all work together to keep it operational. The more moving parts a machine has, the more potential there exists for these parts to generate heat.
Why Are MacBook Chargers So Expensive? Ken Shirriff did a fascinating teardown of Apple's MagSafe 85W charger for his blog and made some surprising discoveries. First of all, Apple puts a lot more components into its chargers than you might expect. The MagSafe charger even includes a 16-bit microprocessor.
Apple's iPhone charger crams a lot of technology into a small space. Apple went to extra effort to provide higher quality and safety than other name-brand chargers, but this quality comes at a high cost.
When your charger MacBook charging, it is natural for your charger to heat up. This is because during the charging process, the charger supplies the Mac laptop with DC power. And when converting from alternating current to direct current, then energy is consumed and is given off in the form of heat.
Your phone charger is most likely hot because you are using the wrong kind of charger with your phone. Alternatively, it could be due to a defect, cheap product, damaged cable, or because you are charging longer than you need to.
Clean dust out of your Mac One of the big problems with fan-based cooling is it draws in dust as well as air. Over time, that builds up and sits on the motherboard and components like a blanket. Removing this dust can stop your Mac overheating and producing loud fan noise.