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HW #7 - Circuits

# HW #7 - Circuits - MasteringPhysics Assignment Print View...

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MasteringPhysics: Assignment Print View Problem 31.58 Part A Suppose the circuit in the figure is grounded at point d. Find the potential at each of the four points a, b, c, and d. ANSWER: = - 4.00 V Part B ANSWER: = 8.00 V Part C ANSWER: = 6.00 V Part D ANSWER: = 0 V Part E Repeat for the same circuit grounded at point a instead of d. ANSWER: = 0 V Part F

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MasteringPhysics: Assignment Print View ANSWER: = 12.0 V Part G ANSWER: = 10.0 V Part H ANSWER: = 4.00 V Problem 31.54 Part A What is the resistance in the figure ? ANSWER: 20.0 Part B What is the emf of the battery in the figure? ANSWER: 60.0 V Power in Resistive Electric Circuits
MasteringPhysics: Assignment Print View Learning Goal: To understand how to compute power dissipation in a resistive circuit. The circuit in the diagram consists of a battery with EMF , a resistor with resistance , an ammeter, and a voltmeter. The voltmeter and the ammeter (labeled V and A) can be considered ideal; that is, their resistances are infinity and zero, respectively. The current in the resistor is , and the voltage across it is . The internal resistance of the battery is not zero. Part A What is the ammeter reading ? Express your answer in terms of , , and . ANSWER: = Note that the resistances of the ammeter and voltmeter do not appear in the answer. That is because these two circuit elements are "ideal." The voltmeter has infinite resistance, so no current flows through it (imagine that there is a short circuit inside the voltmeter). The ammeter has zero resistance, so there is no voltage drop as current flows through it. Part B What is the voltmeter reading ? Part B.1 Part not displayed Express your answer in terms of , , and . ANSWER: = In the following parts, you will express the power dissipated in the resistor of resistance using three different sets of variables.

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MasteringPhysics: Assignment Print View Part C What is the power dissipated in the resistor?
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HW #7 - Circuits - MasteringPhysics Assignment Print View...

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