A device for displaying power consumption rates includes a register for storing and displaying the cost of a unit of power, e.g., the cost per kilowatt hour as assessed by the local power company. A first display indicates the cost of power consumed over a first time period (such as an hour) based upon...http://www.google.co.uk/patents/US5287287?utm_source=gb-gplus-sharePatent US5287287 - Power consumption rate display device
