Energy.
Understand how energy is transformed, stored, and used: batteries, renewables, power, consumption, and efficiency, with scientific context.
Knowledge base
Quantity and unit · Energy
Watt
Unit of power equivalent to one joule per second.
Explore this reference Quantity and unit · Energy
Kilowatt-hour
Unit of energy that combines power and a time interval.
Explore this reference Technology · Energy
Rechargeable battery
A device that stores energy through partially reversible electrochemical processes.
Explore this reference Technology · Energy
Photovoltaic cell
A semiconductor device that converts part of the light it receives into electrical energy.
Explore this reference Concept · Energy
Conversion efficiency
The relationship between a useful output and the corresponding input within a defined system.
Explore this reference