Broadly used like English 'power': physical strength, energy, influence, or capability. Common in compounds and set phrases.
このエンジンはパワーが足りない。
This engine lacks power.
彼は政治的なパワーを持っている。
He has political power.
He showed incredible power for the sake of the team.
I feel like this engine lacks power.
I increased the fan's power with a new battery.
He overpowered the other side's opinion with sheer force.
manpower; labor force; workers