Comparing Efficiency VS.

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Presentation transcript:

Comparing Efficiency VS

EnerGuide and Energy Star Labels When buying an electrical device it is important to consider three things: the price of the device the cost of operating the device over time. The environmental impact of the device EnerGuide labels provides consumers an estimate of how much electrical energy (measured in kWh) the appliance will use in one year. The Energy Star® symbol is used to identify products that meet a minimum level of efficiency.

Cost of Electricity/hour Cost and Energy Comparison 60 W Incandescent Light Bulb vs. 7 W LED Bulb (60 W Equivalent) Device Power (kW) Time (h) Energy Rating (kW·h) Cost of Electricity/hour ($) Cost to run device/day Cost/bulb 60 W incandescent bulb 0.06 8 0.480 0.14 0.0672 0.90 7 W LED bulb 0.007 0.056 0.00784 6.00

Difference between cost of bulbs = $6.00 – 0.90 = $5.10 Difference between cost of electricity/day = $0.0672 – 0.00784 = $0.05936 Time to get bulb cost back Difference between cost of bulbs = difference between cost/day x time (days) $5.10 = 0.05936 x time (days) time (days) = 5.10/0.05936 = 85.9 days It would take about 86 days of usage by the 7W LED bulb to recoup your costs.