Solution Found!
In the circuit of Fig. E25.30, the 5.0-? resistor is
Chapter 25, Problem 34E(choose chapter or problem)
In the circuit of Fig. E25.32, the 5.0-\(\Omega\) resistor is removed and replaced by a resistor of unknown resistance R. When this is done, an ideal voltmeter connected across the points b and c reads 1.9 V. Find (a) the current in the circuit and (b) the resistance R. (c) Graph the potential rises and drops in this circuit (see Fig. 25.20).
Equation Transcription:
Text Transcription:
omega
Questions & Answers
QUESTION:
In the circuit of Fig. E25.32, the 5.0-\(\Omega\) resistor is removed and replaced by a resistor of unknown resistance R. When this is done, an ideal voltmeter connected across the points b and c reads 1.9 V. Find (a) the current in the circuit and (b) the resistance R. (c) Graph the potential rises and drops in this circuit (see Fig. 25.20).
Equation Transcription:
Text Transcription:
omega
ANSWER:
Solution 34E
Here, we shall have to first consider the relation , where V is the potential difference, I is the current and R is the resistance in the circuit. Later, we shall apply Kirchhoff’s voltage law to determine the unknown resistance.
(a) Across the points b and c, the voltage is 1.9 V.
The resistance is .
Therefore, the current is