Energy

Cards (18)

  • Energy: amount of work and its measured in Joules (J)
  • An object may have energy due to its motion or its position
  • Conservation of energy: energy cannot be created or destroyed, when work is done, energy is changed from one form to another.
  • Energy can be stored
  • Kinetic energy is due to motion
  • Gravitational energy is from potential to fall
  • Chemical energy is in chemical bonds
  • Strain energy is compress/stretch
  • Nuclear energy is atoms rearranged/split
  • Internal energy is motion of molecules
  • Electrical energy is carried by electrons
  • Light energy is carried in light waves
  • Sound energy is carried in sound waves
  • What are the types of energy?
    • Kinetic
    • Gravitational
    • Chemical
    • Strain
    • Nuclear
    • Internal
    • Electrical
    • Light
    • Sound
  • The formula for kinetic energy is: Kinetic energy =Kinetic\ energy\ = 12 x Mass x Velocity2\ \frac{1}{2}\ x\ Mass\ x\ Velocity^2 or 12mv2\frac{1}{2}mv^2
  • Gravitational Potential Energy =Mass ×Gravity × Height
  • Due to the processes through which energy transfers take place not being 100% efficient, energy is lost to the surrounding and therefore energy gets more spread out (dissipated)
  • Efficiency = Useful Energy OutputEnergy input x 100\frac{Useful\ Energy\ Output}{Energy\ input}\ x\ 100
    = Userful Power OutputPower input x 100\frac{Userful\ Power\ Output}{Power\ input}\ x\ 100