watthours
Power times duration
Watthours is a unit measuring electrical energy—the amount consumed when one watt of power runs for one hour.
Electric bills typically show kilowatt-hours (thousands of watthours).
Battery capacity is often rated in watthours: This laptop battery holds 50 watthours.
Also spelled watt-hours.
SI energy units
- megajoulesEnergy measurement units
- BTUHeat measurement abbreviation
- thermsHeat quantity units
- caloriesMeasures of food energy
kilocalories · electronvolts · ergs · foot-pounds · energy units · metering · readings · conversion factors
Mobile device battery packs
- energy densityStored power per unit
- charge cyclesFull drain-refill sequences
- lithium-ionRechargeable cell technology
- lead-acidRechargeable electrochemical cell type
deep cycle · battery life · rechargeable · backup power · solar batteries
Appliance consumption classification
- Energy StarEPA efficiency certification program
- conservationPreventing waste or loss
- load managementDeliberately limiting exertion
- smart thermostatsNetworked home temperature regulators
Charges for power consumption
- utility costsFees for essential services
- refrigerationHeat removal for preservation
- standby powerReserve electrical capacity
- peak demandMaximum simultaneous consumption level
off-peak usage · seasonal variation · energy audit · submetering · smart meter
joules
SI energy units
- megajoulesEnergy measurement units
- BTUHeat measurement abbreviation
- thermsHeat quantity units
calories · kilocalories · electronvolts · ergs · foot-pounds · energy units · metering · readings · conversion factors
power banks
Mobile device battery packs
- energy densityStored power per unit
- charge cyclesFull drain-refill sequences
- lithium-ionRechargeable cell technology
lead-acid · deep cycle · battery life · rechargeable · backup power · solar batteries
energy rating
Appliance consumption classification
- Energy StarEPA efficiency certification program
- conservationPreventing waste or loss
- load managementDeliberately limiting exertion
electricity bills
Charges for power consumption
- utility costsFees for essential services
- refrigerationHeat removal for preservation
- standby powerReserve electrical capacity
peak demand · off-peak usage · seasonal variation · energy audit · submetering · smart meter
watthourswatts
Power measurement units
kilowatts · megawatts · power draw · wattage · power rating