"no, strengh is how much you can lift (as an example) and power is a conbination of strengh and speed"
I'd like to add something to this answer that was already here. It's not just strength and speed that make power, it's every attribute applied in whatever the situation may be. For combat, this includes intellect, weaponry and the skill involved in wielding it, non-offensive equipment (bulletproof vest and such), healing capabilities, agility and dexterity (different from speed), and a few more things I'm sure.
However, in a different situation, such as being a successful entrepreneur, power requires neither physical strength nor physical speed.
I'm sure there are some situations in which strength and power are the same, but that would mean that strength is the only thing needed to succeed in those situations.