Equations

• Kinetic energy formula

  kinetic energy = 0.5 x mass x speed2
• Gravitational potential energy formula

  GPE = mass x gravitational field strength x height
• Power equations

  workdone / time taken

  energy transferred / time taken
• Efficiency equation for energy

  useful energy output / total energy output
• Efficiency equation for power

  useful power output / total power output
• Charge flow = current x time
• Potential difference = current x resistance
• Total resistance = resistance of component 1 + resistance of component 2
• Power = current x potential difference
• Power = (current)2 x resistance
• Energy transferred = power x time
• Energy transferred = charge flow x potential difference
• Equation for density

  density = mass / volume