(a)
The potential difference across the switch when it is closed.
(a)
Answer to Problem 21SSC
The potential difference across the switch when it is closed is zero.
Explanation of Solution
Given:
The power of the bulb is
The voltage of the power source is
Formula used:
If potential difference is there across the lamp, then the electric energy is converted into another form.
The expression for resistance is,
Here,
The potential difference is also known as voltage.
The expression for voltage is,
Here,
Consider the current is flowing through a circuit.
The net potential drop in the closed circuit must be equivalent to zero due to the presence of circuit’s electric energy source (battery).
A potential drop occurs in the closed circuit when the current passes through the resistor.
The battery increases the potential drop by the same amount equivalent to the net potential drop in the circuit. So, the potential difference across the switch when it is closed is zero.
Conclusion:
Thus, the potential difference across the switch when it is closed is zero.
(b)
The potential difference across the switch when it is opened.
(b)
Answer to Problem 21SSC
The potential difference across the switch when it is opened is zero.
Explanation of Solution
Given:
The power of the bulb is
The voltage of the power source is
Formula used:
If potential difference is there across the lamp then the electric energy is converted into another form.
The expression for resistance is,
Here,
The potential difference is also known as voltage.
The expression for voltage is,
Here,
If the switch is opened, no power delivered to the lamp. Thenthe current through the circuit will be decreased. Therefore, the potential difference across the switch will be zero.
Conclusion:
Thus, the potential difference across the switch when it is opened is zero.
Chapter 23 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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