A system is disclosed that includes a combustor having an end cover and at least one fuel nozzle assembly extending from an inner face of the end cover. The load current control unit may reset the upper limit in increments or decrements of a predetermined value, and the load current control unit may, when the determination unit has determined that the upper limit had exceeded the current capacity of the feeding device, control the load current by resetting the upper limit to a value not exceeding the current capacity. A corresponding textile machine and a dielectric for a microwave resonator are further disclosed. Particular service may also include providing cross-service functional data, targeted advertising and targeted e-commerce services.