You almost never hear of a DC Watt Meter – one just does some mental math with Volts and Amps at the back of one’s head. An AC Watt Meter, on the other hand, can by pretty useful on any workbench.

Power meters like the Kill-A-Watt are great for keeping track of energy usage, and are also very hackable. The Kill-a-Watt in particular puts out analog signals proportional to current and voltage, ...

Adafruit has this week announced the availability of a new Mini Power Meter complete with Voltage, Current, Watt’s mAh and mWh display, which is capable of supporting a wide variety of different ...

Estimate how much juice your PC is using with a quick calculator, or measure it with a cheap power. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it ...

The power-meter market is more competitive than ever and Body Rocket has arrived as a new entrant with a bold claim – the startup says its power meter is "the most accurate in the world" at 0.1 per ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Growing up, one of my father’s catchphrases was, “Turn off the lights when you leave a room; we’re not ...