I started with a KillAWatt P4400 power meter and the U.S. Department of Energy average of 11 cents per kilowatt hour of electricity. After that, I estimated my own household's average device usage.
我以一只KillWatt P 4400型电表和美国能源部每千瓦平均11美分的价格开始，之后，我评估了我家的使用的所有小设计的平均使用量。
2
Check for oscillations by connecting an oscilloscope in parallel with the device and the meter.
将示波器并联到器件和电压表上，检查振荡情况。
3
The device, which weighs less than 2 kg (4.4 lb) looks like a motorized fan attached to the end of about a half-meter long pipe that can be fitted under a typical pram.