Image forming apparatus

An image forming apparatus comprising:

• a revolving belt configured to revolve and retain a toner image on a peripheral surface thereof;
• a transfer member configured to nip a transported recording medium and the revolving belt at a nipping section and transfer the toner image retained by the revolving belt onto the recording medium by receiving a voltage;
• a guide connected to ground, and configured to guide the recording medium to the nipping section and be in contact with the recording medium nipped at the nipping section;
• and
• a controller configured to determine whether a print resistance is lower than or equal to a system resistance and perform constant current control to transfer the toner image onto the recording medium if it is determined that the print resistance is lower than or equal to a system resistance, the print resistance corresponding to when the voltage is applied to the transfer member in a state where the recording medium is nipped at the nipping section, the system resistance corresponding to when the voltage is applied to the transfer member in a state where the recording medium is not nipped at the nipping section.