## Units, Conversion Factors, Constants and Equations

Units Work J Power W or J/s Force N or Kg m/s Momentum N s or Kg m/s Charge C Speed m/s Distance m Time s Area m Volume m Speed of Light, c 3x108 m/s Electricity Energy=Current*Voltage*time Voltage=Current*Resistance for resistors in series for resistors in parallel P=IV Power=Current*Voltage In a plug, live is brown, neutral is blue and earth is green/yellow. C=np Cost=Number of units*Price per Unit. The voltages around a circuit add up to the battery voltage. Current into a junction=Current Out | Energy GPE=mgh Gravitational Potential Energy=Mass*9.8*Height KE= E=Pt Energy=Power*Time W=Fd Energy=Force*distance Waves speed=frequency*wavelength Forces and Motion Force=Mass*Acceleration Momentum=Mass*Velocity Weight=Mass*9.8 distance=speed*time velocity=acceleration*time Force=Pressure*Area |