Thank you for your response. My question comes from having seen a device advertised that is supposed to reduce the amount of electricity required to operate appliances. In my mind, most appliances are essentially motors (compressors, blenders, microwave ovens, etc.). The reduction is due to eliminating noise. The claimed increase in efficiency is up to 90%, which I don't believe. The noise is purportedly eliminated by filtering noise out of the sine wave. But I don't think the motor is significantly affected by noise on the supplied voltage. Does this seem reasonable?