For more than a century, scientists have relied on separate tools to measure the three core building blocks of electricity: volts, ohms, and amps. Each describes a different piece of how electricity ...

Every student in physics and electronic engineering learns Ohm’s law, E = I x R, or voltage equals current times resistance. You learn that E is electromotive force, a long term for voltage. R is ...

Georg Ohm was a 28-year–old high school physics teacher in 1825 when he first decided to study the effect of the metal in a circuit on the current produced. This experiment was possible because five ...

This popular article was originally published in the Jan. 16, 2019, issue of Radio World and Jan. 24, here at the website. Understanding electronics and electronic troubleshooting starts with knowing ...

There’s hardly any piece of test equipment more fundamental than a volt ohm meter. Today you’re likely to have a digital one, but for most of history, these devices had real needle meters. The ...

Did you know that 1 horsepower is the amount of power required to lift 550 pounds to a height of 1 foot in 1 second? Or, did you know that a foot-pound of torque is literally 1 pound of force exerted ...

If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in ...