Power =............ transferred/ time
Power = ......../time
................... = useful output energy transferred/ total input energy tranferred
Efficiency = useful power output/ ......................
Wave speed = frequency X ........................
Charge flow = ..................... X time
Potential difference= current X ................
Power = ............ X current
Power = current2 X ..........
energy transferred = ....................... X time
Energy transferred = ................. flow X potential difference
density = Mass / .............