Consider a refrigerator that consumes 320 W of electric power when it is running. If the refrige

step 1 In this particular problem, the code that you have to write is power is double dot equals 0 .32

Consider a refrigerator that consumes 320 W of electric...

Consider a refrigerator that consumes $320 \mathrm{W}$ of electric power when it is running. If the refrigerator runs only one quarter of the time and the unit cost of electricity is $\$ 0.09 / \mathrm{kWh},$ the electricity cost of this refrigerator per month $(30 \text { days })$ is $(a) \$ 3.56$ $(b) \$ 5.18$ $(c) \$ 8.54$ $(d) \$ 9.28$ $(e) \$ 20.74$

Consider a refrigerator that consumes $320 \mathrm{W}$ of electric power when it is running. If the refrigerator runs only one quarter of the time and the unit cost of electricity is $\$ 0.09 / \mathrm{kWh},$ the electricity cost of this refrigerator per month $(30 \text { days })$ is
$(a) \$ 3.56$
$(b) \$ 5.18$
$(c) \$ 8.54$
$(d) \$ 9.28$
$(e) \$ 20.74$

Key Concepts

Energy Consumption Calculation

Energy consumption is computed by multiplying the power rating by the time for which the appliance is running. This calculation often requires converting units, such as from watts and hours to kilowatt-hours, which is the standard unit for measuring electrical energy usage.

Unit Conversion

Unit conversion is essential when dealing with different measurement units in calculations. In electrical energy computations, it commonly involves converting watts to kilowatts and seconds or minutes to hours, ensuring that the energy is correctly expressed in kilowatt-hours.

Electric Power

Electric power, measured in watts, represents the rate at which an appliance consumes energy. It is a fundamental measurement that allows us to determine how much energy will be used over a specific period when the appliance is operating.

Duty Cycle

The duty cycle refers to the fraction of time an appliance is active or running. This concept is crucial in calculating actual energy consumption when an appliance does not run continuously, as it scales down the full power consumption based on operating time.

Electricity Cost Calculation

Electricity cost calculation involves multiplying the total energy consumption (in kilowatt-hours) by the cost per kilowatt-hour. This step is critical in translating technical energy usage into practical monetary terms, which is useful for budgeting and cost analysis.

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