Power analyses and sample size calculations are important parts of many research projects. Often, before data are even collected, it is necessary to calculate and justify the required sample size for ...

Oscilloscopes measure current and voltage and, through the magic of mathematics, calculate power. Unfortunately, power comes in a large number of guises: instantaneous, real, apparent, and reactive.

GREENSBORO, N.C. — Whether it’s a hurricane, an ice storm, or even a wildfire, power outages seem to be happening more often and in more places. Maybe you’re thinking about buying a generator to keep ...