Question

Learning Goal: To understand the role of the internal resistance of various devices and the use of the ammeter and the voltmeter. Consider the circuit shown.(Figure 1) All wires are considered ideal; that is, they have zero resistance. We will assume for now that all other elements of the circuit are ideal, too: The value of resistance R is a constant, the internal resistances of the battery (r) and the ammeter (RA) are zero, and the internal resistance of the voltmeter (RV) is infinitely large.

Figure 1Figure 2 of 2 f 2 Part A What is the reading V of the voltmeter? Express your answer in terms of the EMF E. V = Part B The voltmeter, as can be seen in the figure, is connected to points 1 and 3. What are the respective voltage differences between points 1 and 2 and between points 2 and 3? The voltmeter, as can be seen in the figure, is connected to points 1 and 3. What are the respective voltage differences between points 1 and 2 and between points 2 and 3? Part C What is the reading I of the ammeter? Express your answer in terms of E and R. I = Now assume that the battery has a nonzero internal resistancer (but the voltmeter and the ammeter remain ideal). (Figure 2) Part D What is the reading of the ammeter now? Express your answer in terms of E, r, andR. I = Part E What is the reading of the voltmeter now? Express your answer in terms of E, r, andR. V =

Answer 1