Interlock mechanism in image forming apparatus and electrical device

An image forming apparatus comprising:

• an opening and closing portion configured to be capable of opening and closing;
• a switch configured to be turned off when a voltage applied to a drive terminal is smaller than a first voltage and to be turned on when the voltage applied to the drive terminal is greater than or equal to a second voltage that exceeds the first voltage;
• a drive unit configured to generate a drive voltage;
• a first line configured to be used to apply the drive voltage to the drive terminal of the switch;
• a second line arranged such that at least a part thereof is near the first line;
• and
• a voltage drop element provided on the first line and configured to drop the voltage applied to the drive terminal,
• wherein the voltage drop element drops a voltage applied from the second line through the first line to the drive terminal by a predetermined voltage when the first line and the second line short-circuit in a state where the opening and closing portion is open, so as to lower the voltage applied to the drive terminal to be smaller than the first voltage, thereby turning off the switch.