Concept explainers
(a)
The current for the given circuit

Answer to Problem 50PE
Explanation of Solution
Given information:
The voltage of alkaline cell is
An internal resistance is
Voltmeter is used with
The given figure is
Introduction:
Kirchhoff's second rule states that in a closed loop the sum of all the voltages is equal to zero.
Kirchhoff's junction rule states that the sum of all the currents entering a junction is equal to the sum of all the currents leaving the junction.
Ohms law states that at constant temperature potential difference
Where
Equivalent resistance of several resistors connected in series is
It is known that
Ohms law states that at constant temperature potential difference
Where
Equivalent resistance of several resistors connected in series is
It is given that
Resistors are connected in series so
Substitute all the values in
Conclusion:
The current for the given circuit is
(b)
The terminal voltage of the given circuit

Answer to Problem 50PE
Explanation of Solution
Given information:
The voltage of alkaline cell is
An internal resistance is
Voltmeter is used with
The given figure is
Introduction:
Kirchhoff's second rule states that in a closed loop the sum of all the voltages is equal to zero.
Kirchhoff's junction rule states that the sum of all the currents entering a junction is equal to the sum of all the currents leaving the junction.
Ohms law states that at constant temperature potential difference
Where
Equivalent resistance of several resistors connected in series is
It is known that
Ohms law states that at constant temperature potential difference
Where
It is given that
Substitute all the values in
Conclusion:
The terminal voltage of the given circuit is
(c)
The ratio of the measured terminal voltage to the emf for the given circuit

Answer to Problem 50PE
Explanation of Solution
Given information:
The voltage of alkaline cell is
An internal resistance is
Voltmeter is used with
The given figure is
Introduction:
Kirchhoff's second rule states that in a closed loop the sum of all the voltages is equal to zero.
Kirchhoff's junction rule states that the sum of all the currents entering a junction is equal to the sum of all the currents leaving the junction.
Ohms law states that at constant temperature potential difference
Where
Equivalent resistance of several resistors connected in series is
The terminal voltage of the given circuit is
The given emf is
The ratio of the measured terminal voltage to the emf for the given circuit is
Conclusion:
The ratio of the measured terminal voltage to the emf for the given circuit is
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Chapter 21 Solutions
COLLEGE PHYSICS
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