Direct answer
kW vs kWh: Difference Explained (Power vs Energy)
kW is power; kWh is energy. They are not interchangeable without time. 1 kWh = 1 kW used for 1 hour — with examples and caveats.
Question
What is the difference between kW and kWh?
kW measures power; kWh measures energy. 1 kWh is the energy used by 1 kW running for 1 hour.
kW
Power
kWh
Energy
Relationship
kWh = kW x hours
Explanation
Kilowatt (kW) is a rate: how fast energy is being used or produced.
Kilowatt-hour (kWh) is an amount of energy: power multiplied by time.
Use kW for equipment capacity and kWh for electricity consumption or billing.
Important caveat
Do not convert kW to kWh without a time value. A 2 kW heater running for 3 hours uses 6 kWh.