The physics
Every appliance's cost is just power (kilowatts) × time (hours) × price (per kWh).
Yearly cost of a 10 W LED, 5 h a day at €0.20/kWh
Answer: cost per year = 3.65 € (cost per day 0.01 €, cost per month 0.3 €, energy per year 18.3 kWh).
What we know
- Appliance power: 10 W
- Usage per day: 5 hours
- Electricity price: 0.2 €/kWh
Step by step
- Given
- Appliance power = 10 W, Usage per day = 5 hours, Electricity price = 0.2 €/kWh
- Formula
- Cost = (W / 1000) × hours × price per kWh
- Result
- Cost per year = 3.65 €
All results
| Cost per day | 0.01 € |
|---|---|
| Cost per month | 0.3 € |
| Cost per year | 3.65 € |
| Energy per year | 18.3 kWh |
Open the electricity cost calculator with these numbers → and change any of them.