What is watts, volts and amps ?

I never really understood, and any definition I read, I just forget after a while. can someone explain in a way that I won't forget.

the water analogy doesn't help as I get confused between them. also, Watt is the most confusing for me shouldn't it with some unit of time ? like I could say how much water is flowing per second but just saying how much water is flowing without the time wouldn't be very useful, it could be seconds, minutes, hours. yet, the Watt is never written with respect to time, why is that?