Developing cartridge

A developing cartridge, comprising:

• a developing roller rotatable about a rotational axis extending in a first direction;
• a casing configured to accommodate developer therein;
• an input gear rotatable about a first axis extending in the first direction, the input gear being positioned at one side of the casing in the first direction;
• an electrode with an electrical contact surface, and the electrical contact surface being positioned at another side of the casing in the first direction;
• the electrical contact surface is electrically connected to a component of the developing cartridge, the developing roller comprises a developing roller shaft extending in the first direction and an elastic layer rotating synchronously with the developing roller shaft, and an electrical resistance between the electrical contact surface and the developing roller shaft is greater than or equal to 1 MΩ.