Electrical Energy Consumption
Electrical Energy Consumption
Energy — power multiplied by time — is what the utility meters and bills, usually in kilowatt-hours.
The energy is E = P·t. where P is the power and t the running time.
Inputs
P := 2.5 kW=2500 W
t := 6 h=21600 s
Multiply power by time.
E := P·t=5.4e+07 Nm
Results
The result in kilowatt-hours multiplied by the tariff gives the cost. Reducing either power or run time cuts the bill proportionally.
Assumptions & limitations
- Constant power.
- Continuous operation.
- Energy in kWh for billing.