- The material that is to be affected by the application of ultrasonic energy. The load may be plastic, metal, ceramic, liquid, biological, etc.
- The level of power that is transferred to the part e.g., a power supply is heavily loaded if it is operating near its maximum capacity. Also see overload and stall.
- The force or torque that is applied to a part (e.g., to a stud). Also see quasi-static load.