Image forming apparatus acquiring energized state of a plurality of heaters

An image forming apparatus that includes a plurality of heaters as a heat source of a heating rotating body of a fixing unit and in which a combination of each of the heaters to be turned on can be changed, the image forming apparatus comprising:

• a current detection unit including a through-type current transformer in which current supply lines are inserted into or wound around a through hole at a center portion of a ring-shaped core;
• a turn-on information acquisition unit that acquires information on a turn-on mode indicating the combination of each of the heaters to be turned on as turn-on information;
• a connection information acquisition unit that acquires connection information on additive polarity connection and subtractive polarity connection of the heaters, wherein the current supply lines to the plurality of heaters include an additive polarity connection line inserted into or wound around the through hole of the core of the current transformer in additive polarity, and a subtractive polarity connection line inserted into or wound around the through hole of the core of the current transformer in subtractive polarity;
• and
• an energization information acquisition unit that acquires information on an energized state of the plurality of heaters as energization information, based on the turn-on information, the connection information, and a current value output from the current detection unit.