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 at the right is powered by a 60.0-volt power source and utilizes three voltmeters and three ammeters to measure voltage drops and currents. The resistor values are 10.3 Ω (R1), 15.2 Ω (R2) and 12.8 Ω (R3). Determine the ammeter readings and voltmeter readings.
Audio Guided Solution
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Ammeter readings: 1.57 A (for each)
Top voltmeter reading (across R1): 16.1 V
Right voltmeter reading (across R2): 23.8 V
Bottom voltmeter reading (across R3): 20.1 V
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.
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