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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