Image forming apparatus having a connector including a terminal that does not contact any terminal of an attached fixing apparatus

An image forming apparatus comprising:

• an attachment portion to which a fixing apparatus is attached;
• and
• a power supply circuit including a plurality of parallel branches, each of the branches including a wire and a triac,
• wherein the fixing apparatus includes at least one heating element configured to generate heat in a case where the triac of one of the branches is in a conducting state such that electric power is supplied to the at least one heating element via the wire of the one of the branches,
• wherein the image forming apparatus further comprises a connector configured to be connected with a mating connector provided in the fixing apparatus in a state where the fixing apparatus is attached to the image forming apparatus, the mating connector including terminals electrically connected with the at least one heating element, and
• wherein the connector includes:
• (a) a first terminal electrically connected with the wire of the one of the branches and configured to come in contact with one of the terminals of the mating connector in the state where the fixing apparatus is attached to the image forming apparatus;
• and
• (b) a second terminal electrically connected with the wire of another of the branches and configured not to come in contact with any of the terminals of the mating connector in the state where the fixing apparatus is attached to the image forming apparatus.