Power has different meanings depending on the context:

• Power (physics), how fast energy can be changed into work
• Electric power, electricity that comes from power plants or generators
• In sociology, power is the ability of a person to make another person do something. This might also be called influence or control.
• Statistical power, how likely the test is to say something is true when it is really true
• Exponentiation; in mathematics, "power" is multiplying a number by itself.
• A life force, called chi by the Chinese and kiai by the Japanese.
• In politics a great power is more powerful than other countries.
• Joules aren't a unit of power