An image forming apparatus includes a roller, a motor, a control circuit, an interlock switch, and a regeneration diode. The roller is configured to transport a printing sheet or a document sheet. The motor is configured to drive the roller and the motor is supplied electric power from a predetermined power supply system. The control circuit is connected to the predetermined power supply system. The interlock switch is arranged between the motor and the control circuit in the power supply system. The regeneration diode is arranged to the interlock switch. Further, the control circuit includes a processor that acts in accordance with a program, and increases power consumption of the processor by changing an action of the processor if the interlock switch breaks power supply from the power supply system to the motor.