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A student in the laboratory connects a 140 resistor, a 28 resistor, and a 32 Q resistor in series and then connects the arrangement to a 49-V dc source. (a) How much current is in the circuit? (b) How much power is expended in the circuit? W

A student in the laboratory connects a 140 resistor, a 28 resistor, and a 32 Q resistor in series and then connects the arrangement to a 49-V dc source. (a) How much current is in the circuit? (b) How much power is expended in the circuit? W

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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**Laboratory Experiment: Analyzing a Series Circuit** A student in the laboratory connects a 14 Ω resistor, a 28 Ω resistor, and a 32 Ω resistor in series and then connects the arrangement to a 49-V DC source. **Questions:** (a) How much current is in the circuit?     _____ A (b) How much power is expended in the circuit?     _____ W **Need Help?** - Read it - Talk to a Tutor --- **Explanation:** In this experiment, resistors are connected in series which means the total resistance is the sum of the individual resistances. The total voltage provided by the DC source is 49 V. The objective is to calculate the current flowing through the circuit and the power expended using Ohm’s Law and the power formula.
Transcribed Image Text:**Laboratory Experiment: Analyzing a Series Circuit** A student in the laboratory connects a 14 Ω resistor, a 28 Ω resistor, and a 32 Ω resistor in series and then connects the arrangement to a 49-V DC source. **Questions:** (a) How much current is in the circuit?     _____ A (b) How much power is expended in the circuit?     _____ W **Need Help?** - Read it - Talk to a Tutor --- **Explanation:** In this experiment, resistors are connected in series which means the total resistance is the sum of the individual resistances. The total voltage provided by the DC source is 49 V. The objective is to calculate the current flowing through the circuit and the power expended using Ohm’s Law and the power formula.
Expert Solution
Step 1

(a)

The resistors are connected in series. Thus the equivalent resistance will be,

R=R1+R2+R3   =14 Ω+28 Ω+32 Ω   =74 Ω

From Ohm’s law, the current through the circuit will be,

I=VR =49 V74 Ω =0.66 A

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