Image forming apparatus

An image forming apparatus comprising:

• a resistive heat generator;
• a temperature detector configured to detect a temperature of the resistive heat generator;
• and
• a power controller configured to control power supplied to the resistive heat generator,
• the power controller configured to start an examination mode by an external operation, the examination mode that detects a temperature-resistance property of the resistive heat generator,
• the power controller configured to supply the power at a predetermined power duty cycle to the resistive heat generator,
• the power controller configured to obtain the power supplied to the resistive heat generator and a change in the temperature of the resistive heat generator, the temperature that is detected by the temperature detector, while the power controller supplies the power at the predetermined power duty cycle to the resistive heat generator,
• the power controller configured to calculate the temperature-resistance property of the resistive heat generator based on the power and the change in the temperature that are obtained,
• the power controller configured to adjust a power duty cycle at which the power is supplied to the resistive heat generator based on the temperature-resistance property.