Question 1

Refer to the first image (current vs. voltage graph for materials A and B). At voltage $$V_1$$, which material has the greater resistance, and why?

Accepted Answer

Material A, because it allows less current to flow at $$V_1$$ than material B.

Question 2

In the first image, which material (A or B) obeys Ohm's law, and how can you tell?

Accepted Answer

Material A, because its I-V curve is linear.

Question 3

Refer to the second image (four conducting cylinders). All cylinders are made of the same material and have the same current $$I. $$Which cylinder requires the largest voltage to maintain the current, and why?

Accepted Answer

Cylinder 2, because it is the longest and thinnest.

Question 4

In the third image (three capacitor circuits A, B, C), after the switches are closed and equilibrium is reached, which circuit has the greatest charge on the left plate of the upper capacitor?

Accepted Answer

Circuit C

Question 5

In the third image, what is the ranking of the circuits in order of increasing charge on the left plate of the lower capacitor?

Accepted Answer

B \u003c A = C

Question 6

Refer to the fourth image (nerve impulse propagation). In the RC model of a nerve axon, what effect does the myelin sheath have on the speed of nerve impulse propagation?

Accepted Answer

It increases the wall resistance and decreases the capacitance, speeding up the impulse.

Question 7

In the fifth image (series circuit with three bulbs and a switch), what happens to the brightness of bulb 2 when the switch is closed?

Accepted Answer

It decreases.

Question 8

In the fifth image, what happens to the brightness of bulbs 1 and 3 when the switch is closed?

Accepted Answer

They increase.

Question 9

Refer to the sixth image (parallel circuit with three bulbs and a switch). What happens to the total power dissipated in the circuit when the switch is closed and bulb 3 is added?

Accepted Answer

It increases.

Question 10

In the sixth image, what happens to the brightness of bulbs 1 and 2 when the switch is closed?

Accepted Answer

They stay the same.

Question 11

Refer to the seventh image (capacitors $$C_1 = C$, C_2$ = 2C in $$series with an ammeter). After a long time, which capacitor has the larger voltage across it?

Accepted Answer

$$C_1$$, because it has smaller capacitance.

Question 12

Refer to the eighth image (three circuits A, B, C with resistors and capacitors). In which circuit does the capacitor charge to 90% of its final value in the shortest time?

Accepted Answer

Circuit A

Question 13

Refer to the ninth image (solar panel I-V curve). At which point on the curve does the solar panel deliver maximum power to the load?

Accepted Answer

Point C

Physics with Calculus: Electric Current, Circuits, and Capacitance – Visual Study Guide

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