Math Problem Statement
Your utility company charges 11 cents per kilowatthour of electricity. a. What is the daily cost of keeping lit a 100watt light bulb for 13 hours each day? b. How much will you save in a year if you replace the bulb with an LED bulb that provides the same amount of light using only 15 watts of power?
Solution
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Math Problem Analysis
Mathematical Concepts
Electricity consumption
Power calculations
Cost calculations
Formulas
Power in kilowatts = Power in watts / 1000
Energy consumption (kWh) = Power (kW) × Time (hours)
Daily cost = Energy consumption (kWh) × Cost per kWh
Annual cost = Daily cost × 365 days
Theorems

Suitable Grade Level
High School
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