杏吧原创

Chargers get slim

Modern mobile phone chargers are much lighter and less bulky than they used to be. I assume that this is because they no longer use a transformer with a metal core to step the voltage down. So how do they work?

John Dyer, Haslemere, Surrey, UK

Topics: Last Word

More from New 杏吧原创

Explore the latest news, articles and features

Popular articles

Trending New 杏吧原创 articles

We鈥檙e finally learning what happens to gifted children in adulthood

Why a Ukrainian cruise missile is flying with hobby drone hardware

Game that reduces dementia risk may clear amyloid from men’s brains

Alzheimer鈥檚, stroke, depression: The preventative power of sauna

Stealth drone spins so fast that it disappears

Neurostimulation restores feeling in paralysed hand for months after

Why the upcoming eclipse is still vital in the age of solar probes

Best treatment for multiple sclerosis may be antivirals

Can everyone live a 鈥榞ood life鈥� without destroying the planet?

Ancient Egyptian princesses buried with weapons may have been fighters