An electrically operated aerosol-generating system comprising an aerosol-generating device, a first removable aerosol-forming cartridge comprising at least a first resistive heater, and a second removable aerosol-forming cartridge comprising at least a second resistive heater, wherein the first removable aerosol-forming cartridge comprises a first aerosol-forming substrate requiring a first heating profile and the second removable aerosol-forming cartridge comprises a second aerosol-forming substrate requiring a second heating profile, and wherein the aerosol-generating device comprises: a main body defining a cavity and at least one opening for removably receiving one of the first and second aerosol-forming cartridges (40, 60) in the cavity; an electrical power supply; and a control unit for controlling a supply of electrical current from the electrical power supply to the first or second resistive heater; wherein the first aerosol-forming cartridge comprises a first electrical load comprising the resistive load of the first resistive heater and configured to electrically connect with the control unit when the first aerosol-forming cartridge is received within the cavity; wherein the second aerosol-forming cartridge comprises a second electrical load comprising the resistive load of the second resistive heater and configured to electrically connect with the control unit when the second aerosol-forming cartridge is received within the cavity, and wherein the second electrical load is different to the first electrical load; wherein the control unit is configured to measure the electrical load when an aerosol-forming cartridge is received within the cavity to detect whether the first or second aerosol-forming cartridge (40, 60) has been received within the cavity; and wherein the control unit is arranged to control the supply of electrical current to the first resistive heater or the second resistive heater according to either the first or the second heating profile based at least in part on the measured electrical load. a main body defining a cavity and at least one opening for removably receiving one of the first and second aerosol-forming cartridges (40, 60) in the cavity; an electrical power supply; and a control unit for controlling a supply of electrical current from the electrical power supply to the first or second resistive heater; wherein the first aerosol-forming cartridge comprises a first electrical load comprising the resistive load of the first resistive heater and configured to electrically connect with the control unit when the first aerosol-forming cartridge is received within the cavity; wherein the second aerosol-forming cartridge comprises a second electrical load comprising the resistive load of the second resistive heater and configured to electrically connect with the control unit when the second aerosol-forming cartridge is received within the cavity, and wherein the second electrical load is different to the first electrical load; wherein the control unit is configured to measure the electrical load when an aerosol-forming cartridge is received within the cavity to detect whether the first or second aerosol-forming cartridge (40, 60) has been received within the cavity; and wherein the control unit is arranged to control the supply of electrical current to the first resistive heater or the second resistive heater according to either the first or the second heating profile based at least in part on the measured electrical load.