Cooking appliance comprising - a plurality of heat sources, - an actuator associated to each heat source, which is operated by a user to act on the corresponding heat source, - switches, one switch associated to each actuator, whose state changes when the user acts on the corresponding actuator, - a connection to an external power supply, said power supply being an alternating voltage supply, through which said appliance is powered, and which comprises two terminals (T1, T2), and - a control unit adapted, when at least one of said actuators has been operated on, to detect a change of state of the switches and to identify which actuator has been operated on in accordance with said switches, a first end of each switch being connected to the connection and a second end of each switch being connected to said control unit, the second end of each switch being connected to the control unit by means of a respective adaptor, so that each adaptor, when the corresponding actuator has been operated on, adapts the alternating voltage present in the second end of the corresponding switch to an acceptable voltage for said control unit, each switch being connected in series to the connection, so that the appliance does not consume energy from the external power supply unless at least one actuator is acted on, characterised in that it comprises a supply unit adapted to adapt the voltage present in the connection (l) to all the voltages necessary in the appliance, the cooking appliance also comprising, either - a blocking member for each switch, the first end of each switch being connected to one of the terminals of the connection and the second end of each switch being connected to the respective blocking member, each blocking member being connected to the supply unit, the blocking members carrying the same voltage to the supply unit at the same time as they maintain the independence of each of the second ends of the different switches, the other terminal of the connection being connected directly to the supply unit; or - a complete blocking member, the first end of each switch being connected to one of the terminals of the connection and the second end of each switch being connected to a respective input of the complete blocking member, the other terminal of the connection that is not associated to said switches being also connected to a respective input of said complete blocking member, the complete blocking member comprising two outputs connected to the supply unit through which both terminals (T1, T2) of the connection are connected to said supply unit. - a plurality of heat sources, - an actuator associated to each heat source, which is operated by a user to act on the corresponding heat source, - switches, one switch associated to each actuator, whose state changes when the user acts on the corresponding actuator, - a connection to an external power supply, said power supply being an alternating voltage supply, through which said appliance is powered, and which comprises two terminals (T1, T2), and - a control unit adapted, when at least one of said actuators has been operated on, to detect a change of state of the switches and to identify which actuator has been operated on in accordance with said switches, a first end of each switch being connected to the connection and a second end of each switch being connected to said control unit, - a blocking member for each switch, the first end of each switch being connected to one of the terminals of the connection and the second end of each switch being connected to the respective blocking member, each blocking member being connected to the supply unit, the blocking members carrying the same voltage to the supply unit at the same time as they maintain the independence of each of the second ends of the different switches, the other terminal of the connection being connected directly to the supply unit; or - a complete blocking member, the first end of each switch being connected to one of the terminals of the connection and the second end of each switch being connected to a respective input of the complete blocking member, the other terminal of the connection that is not associated to said switches being also connected to a respective input of said complete blocking member, the complete blocking member comprising two outputs connected to the supply unit through which both terminals (T1, T2) of the connection are connected to said supply unit.