Choose whether the given unit is a unit of power or a unit of energy.
unit of power: joule/sec (J/s)
unit of energy: watt x year (Wyr) (costs about $1)
unit of energy: calorie (cal)
unit of energy: kilojoule (kJ)
unit of power: kilowatt (kW)
unit of power: watt (W)
unit of energy: kilowatt x hour (kWh) (costs about $0.10)
unit of power: megawatt (MW)
unit of energy: kilocalorie (kcal)
unit of power: kilowatt x hr / year (kWh / yr)
unit of energy: joule (J)
unit of power: gigawatt (GW)