Electricity: Electric Circuits
Electric Circuits: Audio Guided Solution
Voltmeters can be used to determine the voltage across two points on a circuit. An ammeter can be used to determine the current at any given location on a circuit. The circuit below is powered by a 24.0-volt power source and utilizes four voltmeters and three ammeters to measure voltage drops and currents.
The resistor values are 54.5 Ω (R1), 31.7 Ω (R2) and 48.2 Ω (R3). Determine the ammeter readings and voltmeter readings.
Audio Guided Solution
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Left ammeter reading (in R1 branch): 0.440 A
Middle ammeter reading (in R2 branch): 0.757 A
Right ammeter reading (in R3 branch): 0.498 A
Bottom ammeter reading (outside branches): 1.695 A
Voltmeter readings: 24.0 V (for each)
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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