To understand the role of the internal resistance of various devices and the use

Question

To understand the role of the internal resistance of various devices and the use of the ammeter and the voltmeter Part A What is the reading V of the voltmeter? Express your answer in terms of the EMF &. 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 Ris 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 1 of2 Submit My Answers Give ry Incorrect; Try Again 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? 0;

Explanation / Answer

  I = E / (Ri+R)

V = IR = R•E / (Ri+R)

P = VI

P = I²R

P = V²/R = [ R•E / (Ri+R) ]² / R = E²R / (Ri+R)²

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