1) Power is defined as the ability to influence others to act according to one's wishes through control or dependency, while leadership focuses on goal achievement through compatible goals and downward influence.
2) There are various bases of power, including formal power derived from positions and personal power based on skills/knowledge or traits. Dependency is key to power, with greater dependency resulting in greater power.
3) Politics involves attempts to influence the distribution of advantages through non-required activities, and can be seen positively as effective management or negatively as political behavior depending on perspective.