Electricity: Electric Circuits
Electric Circuits: Audio Guided Solution
Problem 14:
A central air conditioner in a typical American home operates on a 220-V circuit and draws about 15 A of current.
a. Determine the power rating of such an air conditioner.
b. Determine the energy consumed (in kW•hr) if operated for 8 hours per day.
c. Determine the monthly cost (31 days) if the utility company charges 13 cents per kW•hr.
a. Determine the power rating of such an air conditioner.
b. Determine the energy consumed (in kW•hr) if operated for 8 hours per day.
c. Determine the monthly cost (31 days) if the utility company charges 13 cents per kW•hr.
Audio Guided Solution
Habits of an Effective Problem Solver
- Read the problem carefully and develop a mental picture of the physical situation. If necessary, sketch a simple diagram of the physical situation to help you visualize it.
- Identify the known and unknown quantities and record them in an organized manner. Equate given values to the symbols used to represent the corresponding quantity - e.g., ΔV = 9.0 V; R = 0.025 Ω; I = ???.
- Use physics formulas and conceptual reasoning to plot a strategy for solving for the unknown quantity.
- Identify the appropriate formula(s) to use.
- Perform substitutions and algebraic manipulations in order to solve for the unknown quantity.
Read About It!
Get more information on the topic of Electric Circuits at The Physics Classroom Tutorial.
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