physics equations paper 1

• gravotational potential energy


  mass x gravotational field strength x height
• power


  current^2 x resistance
• efficiencey 


  useful output energy transfer/total input energy transfered
• energy transfer


  power x time
• energy transferred


  charge flow x potential diffrece
• power


  potential diffrance x curent
• power

  work done/ time
• power


  energy trasferred/time
• potential diffrence


  current x time
• kinetic energy 


  0.5 x mass x speed^2
• charge flow


  current x time
• dencity


  mass/volume
• efficiency


  useful power output/ total power input