The invention claimed is:1. An image processing apparatus comprising one or more processors configured to:fluctuate an output power of a power supply circuit that supplies power to a load;identify a connection relationship between the power supply circuit and the load based on a correlative relationship between a fluctuation of the output power and a fluctuation of the power supplied to the load;identify an expansion device electrically connected to a main body; anddetermine whether a connection relationship between the expansion device and the power supply circuit is correct or incorrect, based on the identified connection relationship and the identified expansion device, whereinthe power supply circuit has a main body power supply circuit provided in the main body having an image processing function,the load has an expansion device electrically and detachably connected to the main body,a plurality of expansion devices are configured to connect to the main body,the one or more processors are configured to identify a combination of the plurality of expansion devices, andthe one or more processors are configured to estimate a total power consumption of an entire image processing apparatus including the plurality of expansion devices whose combination is identified, and determine, in light of the total power consumption, whether the connection relationship is correct or incorrect.2. The image processing apparatus according to claim 1, whereinthe power supply circuit is one of a plurality of power supply circuits,the plurality of power supply circuits is provided, andthe one or more processors are configured to identify at least which one of the plurality of power supply circuits is connected to the load.3. The image processing apparatus according to claim 1, whereinthe one or more processors are configured to fluctuate the output power by stopping an output of the power supply circuit.4. The image processing apparatus according to claim 1, whereinthe load has a controller configured to detect the power, andthe one or more processors are configured to fluctuate the output power within a range in which at least the controller is configured to continue to operate.5. An image processing method comprising:fluctuating an output power of a power supply circuit that supplies power to a load;identifying a connection relationship between the power supply circuit and the load based on a correlative relationship between a fluctuation of the output power and a fluctuation of the power supplied to the load;identifying an expansion device electrically connected to a main body; anddetermining whether a connection relationship between the expansion device and the power supply circuit is correct or incorrect, based on the identified connection relationship and the identified expansion device, whereinthe power supply circuit has a main body power supply circuit provided in the main body having an image processing function,the load has the expansion device electrically and detachably connected to the main body,a plurality of expansion devices are configured to be connected to the main body, andin determining whether the connection relationship is correct or incorrect, a combination of the plurality of expansion devices is identified, a total power consumption of an entire image processing apparatus including the plurality of expansion devices whose combination is identified is estimated, and it is determined, in light of the total power consumption, whether the connection relationship is correct or incorrect.6. A computer-readable non-transitory recording medium on which a program is recorded, whereinthe program for causing one or more processors to execute:fluctuating an output power of a power supply circuit that supplies power to a load;identifying a connection relationship between the power supply circuit and the load based on a correlative relationship between a fluctuation of the output power and a fluctuation of the power supplied to the load;identifying an expansion device electrically connected to a main body; anddetermining whether a connection relationship between the expansion device and the power supply circuit is correct or incorrect, based on the identified connection relationship and the identified expansion device, whereinthe power supply circuit has a main body power supply circuit provided in the main body having an image processing function,the load has the expansion device electrically and detachably connected to the main body,a plurality of expansion devices are configured to be connected to the main body, andin determining whether the connection relationship is correct or incorrect, a combination of the plurality of expansion devices is identified, a total power consumption of an entire image processing apparatus including the plurality of expansion devices whose combination is identified is estimated, and it is determined, in light of the total power consumption, whether the connection relationship is correct or incorrect.
