Dear Experts, I would like to solicit your comments about energy saving devices (electric consumption reducer) which is being advertised in malls, streets, tv, etc. Here’s my story: Recently I’ve attended a Science Fair Competition and there’s a man claiming that the device he made can save electric energy consumption. The instruments he showed to us are power source (ac), home electric meter (dial type), a blower, and, the claimed energy saving device. At first, he connects the blower into the electric meter which is connected to a power source. The disc of the electric meter rotates at constant speed (I think about 4 sec/turn). But when he plugged the blower to his energy saving device, the disc rotation suddenly slowed down and at a certain time, it stops! The blower still operates at good. He just showed us what’s inside the energy saving device and it’s composed of an IC circuit, capacitors, diodes, etc. My questions are: 1. Is it true that there are certain device can stop the rotation of the disc? 2. Are all these energy saving device truly saves your electric energy consumption? and 3. Is there no harmful effects in your appliances, etc.?