Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at www ...

In the original version of this article, the second figure contained an error. The image has been updated. It’s important for engineers to have a good, working ...

There are two types of electrical current: direct and alternating. Each one has unique benefits and disadvantages. Batteries, whether they’re small enough to power your smartwatch or big enough to run ...