Question: Kim, We've just had an in-office dispute. Carney seems to think that chargers with bigger bricks charge his phone faster, and I think that he's just got a placebo effect, and the size of your charger, has no effect on how fast your phone charges. Who's right, Kim? -- Josh and Carney who host a show on 550 AM KTRS St. Louis
Answer: People have been polarized by this issue for years. There's mixed opinion about whether bigger is better. But John is so smart and it's true, charging with bigger bricks is faster. By bigger brick, I am guessing that you meant a charger with higher amperage (flow of current) usually indicated by wattage. If this is the case, then yes, phones will charge faster. Let me explain.
For example, iPad chargers, which are rated 12W or 10W, will charge iPhones faster compared to the iPhone's smaller default 5W charger.
Conversely, using an iPhone charger or a computer's USB port (computer USB 1.0 and 2.0 ports a mere 2.5W and USB 3.0 is 4.5W) to charge an iPad (or any other gadget) will be slower.
Apple verifies this. According to the page:
Apple USB power adapters for iPad can also be used to charge the iPhone, iPod, Apple Watch, AirPods, and other Apple products. You can use Apple 12W and 10W USB power adapters to charge your iPad, iPhone, iPod, Apple Watch, and other Apple accessories, like AirPods and Siri Remote. Just connect your device to the power adapter with the Lightning to USB Cable, 30-pin to USB cable, or Apple Watch charger that came with your device.
Using an Apple 12W or 10W USB power adapter can charge some Apple devices and accessories faster than a 5W power adapter. When using an Apple 29W USB-C Power Adapter and Apple USB-C to Lightning cable, you can fastly charge your iPad Pro 12.9-inch.
Beware of higher amperage third-party and cheap knock-off chargers, though, due to current inconsistencies, and these may lead to overheating. Also, some phones, especially Android smartphones, have proprietary fast charging technologies that are not compatible with other charging methods.
If you want to read further and know why some smartphones explode, check out this article.