A power over Ethernet power utilization arrangement comprising: a powered device interface; a current path arranged to carry a current between a power sourcing equipment and the powered device interface; a return path of the carried current; the powered device interface comprising: a voltage detector (50, 270) arranged to detect a first function of a voltage between said current path and said return path during a first time period and during a second time period, said second time period different than said first time period; a current sensor (40, 300) arranged to sense a second function of a magnitude of the carried current during said second time period; and a control circuitry (60, 250), wherein said control circuitry is arranged to: receive from said voltage detector an indication of said detected first time period voltage function; receive from said voltage detector an indication of said detected second time period voltage function; receive from said current sensor an indication of said detected second time period current magnitude function; CHARACTERIZED IN THAT responsive to said received first time period voltage function, second time period voltage function and second time period current magnitude function, determine a third function of a resistance seen by said current path; and output an indication of said determined resistance function to a load, the load arranged to increase, or decrease, power consumption responsive to the determined resistance. a powered device interface; a current path arranged to carry a current between a power sourcing equipment and the powered device interface; a return path of the carried current; the powered device interface comprising: a voltage detector (50, 270) arranged to detect a first function of a voltage between said current path and said return path during a first time period and during a second time period, said second time period different than said first time period; a current sensor (40, 300) arranged to sense a second function of a magnitude of the carried current during said second time period; and a control circuitry (60, 250), wherein said control circuitry is arranged to: receive from said voltage detector an indication of said detected first time period voltage function; receive from said voltage detector an indication of said detected second time period voltage function; receive from said current sensor an indication of said detected second time period current magnitude function; CHARACTERIZED IN THAT responsive to said received first time period voltage function, second time period voltage function and second time period current magnitude function, determine a third function of a resistance seen by said current path; and output an indication of said determined resistance function to a load, the load arranged to increase, or decrease, power consumption responsive to the determined resistance. a voltage detector (50, 270) arranged to detect a first function of a voltage between said current path and said return path during a first time period and during a second time period, said second time period different than said first time period; a current sensor (40, 300) arranged to sense a second function of a magnitude of the carried current during said second time period; and a control circuitry (60, 250), wherein said control circuitry is arranged to: receive from said voltage detector an indication of said detected first time period voltage function; receive from said voltage detector an indication of said detected second time period voltage function; receive from said current sensor an indication of said detected second time period current magnitude function; CHARACTERIZED IN THAT responsive to said received first time period voltage function, second time period voltage function and second time period current magnitude function, determine a third function of a resistance seen by said current path; and output an indication of said determined resistance function to a load, the load arranged to increase, or decrease, power consumption responsive to the determined resistance. receive from said voltage detector an indication of said detected first time period voltage function; receive from said voltage detector an indication of said detected second time period voltage function; receive from said current sensor an indication of said detected second time period current magnitude function; CHARACTERIZED IN THAT responsive to said received first time period voltage function, second time period voltage function and second time period current magnitude function, determine a third function of a resistance seen by said current path; and output an indication of said determined resistance function to a load, the load arranged to increase, or decrease, power consumption responsive to the determined resistance.