Abstract: Power measuring apparatus for electric appliances including interconnected male and female connectors for attachment to a source of power and to an appliance to be measured, a transformer having a primary winding in series with one of the conductors interconnecting the connectors, a potentiometer having a resistance element connected with the secondary winding on said transformer and a movable contactor, and an indicator connected between the contactor and one end of the resistance element, the potentiometer being calibrated in terms of cost per kilowatt-hour and the indicator being calibrated in terms of cost per hour.

Abstract: An electrical connector for providing low voltage energy to portable electrical devices and includes a receptacle portion and a plug. The plug has means for engaging the receptacle portion and means for engaging the device to be energized.