Sun Power

Class II

• Review of previous class
• Solving simple formulas: the basic idea of algebra
• Powers of ten and "scientific notation"
• Quantities: Names and Units
  • length, mass, time
  • velocity and acceleration
  • Force, work, and energy (joules)
  • Power and energy: general, electrical (watts)
  • Intensity

  Quantity Name	Quantity Units
  length	meters (m), feet (ft), mile (mi)
  time	second (s), hour (hr), year (yr)
  mass	pound (lb), kilogram (kg), ton (t)
  velocity	m/s, ft/s, mi/hr
  acceleration	m/s2, ft/s2
  Force =  mass x acceleration	Newton (N) = kg m/s2
  Work = Force x distance, Energy transferred = Work Done	Joule (J) = N x m = kg m2/s2
  Power = Energy/Time Energy = Power x Time	watt (w)  = J/s
  Intensity = Power / Area	w/m2