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Calculate the Cost of Electricity Consumption (1)
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Definition of energy efficiency
Energy efficiency is the percentage of energy input converted to useful form of energy output
Energy efficiency formula
Example of lightning device (1)
Filament lamp
Example of lightning device (2)
Energy saving lamp (compact fluorescent lamp, CFL)
Example of lightning device (3)
LED lamp
Energy efficiency of filament lamp
Maximum electrical energy converted to light energy ≈ 10%
Energy efficiency of energy saving lamp (compact fluorescent lamp, CFL)
Maximum electrical energy converted to light energy ≈ 50%
Energy efficiency of LED lamp
Maximum electrical energy converted to light energy ≈ 90%
The efficiency of filament bulb
The filament bulb lasts approximately 1 000 hour
The efficiency of energy saving lamp (compact fluorescent lamp, CFL)
Lasts approximately 8 000 hours
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Calculate the Cost of Electricity Consumption (1)
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