Developing cartridge with housing having a driving side and an opposite side, developing roller rotatably supported by the housing, supply roller rotatably supported by the housing, doctor blade supported by the housing, driving gear on the driving side, detected component, power receiving component that receives power and electrically connected to the doctor blade

A developing cartridge, comprising:

• a housing;
• a developing roller rotatably supported by the housing, the developing roller being rotatable about an axis extending in a first direction, and the developing roller having a developing roller shaft;
• a supply roller rotatably supported by the housing and configured to convey developer to the developing roller, the supply roller having a supply roller shaft;
• and
• a driving gear disposed on a driving side of the housing in the first direction;
• wherein the developing cartridge further comprises a first electrical connection component and a third electrical connection component, the first electrical connection component is disposed on an opposite side of the driving side of the housing, the third electrical connection component is disposed on the driving side of the housing, the opposite side of the driving side and the driving side are located on opposite sides of the housing in the first direction, and in the first direction, one end of the supply roller shaft is in contact with the first electrical connection component, and the other end of the supply roller shaft is in contact with the third electrical connection component, wherein the third electrical connection component is simultaneously in contact with the supply roller shaft and the developing roller shaft.