Hand-held tool with a control device for an electric heating element

Hand-held implement， in particular portable， hand-held implement， with at least one internal combustion engine (8) for driving a work tool， a fuel / air mixture being supplied to the internal combustion engine (8) for operation via a carburetor (10)， and with a handle (3 ， 4) for guiding the implement (1)， the handle (3， 4) and / or the carburetor (10) having an electric heating element (13， 33， 34) is provided for heating to a predetermined temperature， the heating element (13， 33， 34) being connected to a switch (LS) via which electrical energy is supplied for heating the heating element (13， 33， 34) a generator (23) driven by the internal combustion engine (8) is provided， and the switch (LS) interrupts the supply of energy to the heating element (13， 33， 34) when a predetermined temperature is exceeded， The ohmic resistance value of the heating element (13， 33， 34) as a function of the temperature is stored in a memory (48)， that the current (I) flowing through the heating element (13， 33， 34) and the current at the heating element (13， 33， 34) falling voltage (U H) that the current resistance of the heating element (13， 33， 34) is calculated from the measured quantities， and that the calculated current ohmic resistance value is compared with a value stored in the memory (48) and depending on the comparison result of the switches (LS ) is opened or closed， the working device (1) having a plurality of heating elements (13， 33， 34)， the current resistances of which are calculated in succession， characterized in that that each of the plurality of heating elements (13， 33， 34) is assigned a priority level and， if necessary， the electrical energy is initially supplied to the heating element with the highest priority level and the energy available to the heating element with the following lower priority level is supplied.