Physics > QUESTION PAPER (QP) > Case Western Reserve University - PHYSICS 122practice5 (All)

Case Western Reserve University - PHYSICS 122practice5

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Physics 122 Spring 2016 Practice Problems 5 Practice problems are not for credit and will not be graded. They will be helpful in preparation for the Final exam on Monday May 2, 2016 Parts marked w ... ith an asterisk are only to be read. No response is needed. Parts marked Optional contain material that I hope you will learn but that we are unlikely to put on an exam. Figure 1: (Left). A non-ideal battery. (Right) A current source. 1. Simple dc circuits. (a) Non-ideal battery. Consider the circuit shown in fig 1 to the left. The external load is some unspecified network of resistors and batteries. For the present purpose it is sufficient to know that a current i is drawn into the external load. (i) What is the potential difference VA − VB? ∗(ii) An ideal battery always maintains a specified potential across its two terminals. A real battery can be modeled as an ideal battery with emf E and a resistor r that is connected in series with the ideal battery as in fig 1. Thus VA − VB represents the actual voltage across the terminals of the battery. As you found in part (i) the voltage across the terminals of the battery is smaller than the ideal voltage E by an amount that is proportional to the current drawn by the load. (b) Current Source. Now consider the circuit shown in fig 1 to the right. Assume for simplicity that the external load is a simple resistor r. [Show More]

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