This is our second activity that requires the use of a smartphone or tablet. Please let us know what you think. E-mail editors@sciam.com with feedback about the use of technology in this—and ...

For such measurements, goniophotometers (from the Greek “gonia,” an angle; “photos,” light; and “metron,” measure) have been used by traditional lighting manufacturers for some time. For the most part ...

Let's start with DC voltage, one of the simplest and most-used multimeter measurements. The DC voltage measurement is used to determine the difference in electrical potential between two points in a ...