Energy gauge

摘要

An energy gauge for indicating the amount of residual power available from a battery that is not connected to a mains supply includes means for storing a predetermined value of a power parameter indicative of full battery capacity, means for determining the instantaneous power consumption indicated by the parameter, means for integrating the power consumption indicative of the parameter since commencement of use of the battery, means for subtracting the integrated consumption from the stored value of full capacity to provide a value of power remaining, and readout means for providing a representation of the power remaining.