Conceptual Questions

Rank in order, from largest to smallest, the currents $I_{A}$ to $I_{D}$ through the four resistors in FIGURE Q28.1.

FIGURE Q28.1

FIGURE Q28.1 Full Alternative Text
The tip of a flashlight bulb is touching the top of the 3 V battery in FIGURE Q28.2. Does the bulb light? Why or why not?

FIGURE Q28.2
The wire is broken on the right side of the circuit in FIGURE Q28.3. What is the potential difference $V_{1} - V_{2}$ between points 1 and 2? Explain.

FIGURE Q28.3

FIGURE Q28.3 Full Alternative Text
The circuit of FIGURE Q28.4 has two resistors, with $R_{1} > R_{2}$ . Which of the two resistors dissipates the larger amount of power? Explain.

FIGURE Q28.4

FIGURE Q28.4 Full Alternative Text
The circuit of FIGURE Q28.5 has two resistors, with $R_{1} > R_{2}$ . Which of the two resistors dissipates the larger amount of power? Explain.

FIGURE Q28.5

FIGURE Q28.5 Full Alternative Text
Rank in order, from largest to smallest, the powers $P_{A}$ to $P_{D}$ dissipated by the four resistors in FIGURE Q28.6.

FIGURE Q28.6

FIGURE Q28.6 Full Alternative Text
A battery with internal resistance $r$ is connected to a load resistance $R$ . If $R$ is increased, does the terminal voltage of the battery increase, decrease, or stay the same? Explain.
Initially bulbs A and B in FIGURE Q28.8 are glowing. What happens to each bulb if the switch is closed? Does it get brighter, stay the same, get dimmer, or go out? Explain.

FIGURE Q28.8

FIGURE Q28.8 Full Alternative Text
Bulbs A, B, and C in FIGURE Q28.9 are identical, and all are glowing.
1. Rank in order, from most to least, the brightnesses of the three bulbs. Explain.
2. Suppose a wire is connected between points 1 and 2. What happens to each bulb? Does it get brighter, stay the same, get dimmer, or go out? Explain.
FIGURE Q28.9

FIGURE Q28.9 Full Alternative Text
In the circuit of FIGURE Q28.10, is the resistance between points 1 and 2 (a) less than $100 Ω$ , (b) between $100 Ω$ and $150 Ω$ , (c) more than $150 Ω$ , or (d) is it not possible to say without knowing the values of all the resistors? Explain.

FIGURE Q28.10

FIGURE Q28.10 Full Alternative Text
Bulbs A and B in FIGURE Q28.11 are identical, and both are glowing. What happens to each bulb when the switch is closed? Does its brightness increase, stay the same, decrease, or go out? Explain.

FIGURE Q28.11

FIGURE Q28.11 Full Alternative Text
FIGURE Q28.12 shows the voltage as a function of time of a capacitor as it is discharged (separately) through three different resistors. Rank in order, from largest to smallest, the values of the resistances $R_{1}$ to $R_{3}$ .

FIGURE Q28.12

FIGURE Q28.12 Full Alternative Text