Chapter 21

Question 1

Resistors in series

Answer 1

SAME CURRENT (I).
R1+R2...

Question 2

Resistors in parallel

Answer 2

SAME POTENTIAL DIFFERENCE (V).

R1R2/R1+R2

Question 3

Current

Answer 3

Current decrease when going through resistors

Question 4

When the switch is closed, power Pc is delivered to resistor R1. When the switch is opened, which of the following statements is true about the power Po delivered to R1?

Answer 4

Po < Pc

Question 5

In the figure below, the current is measured with the ammeter on the right side of the circuit diagram. When the switch is closed, the reading on the ammeter?

Answer 5

Increases

Question 6

Suppose you have several identical lightbulbs, some wire, and a battery. You connect one lightbulb to the battery and take note of its brightness. You add a second lightbulb, connecting it in series with the previous lightbulb, and again take note of the brightness. As the lightbulbs are added, their brightness

Answer 6

Decreases

Question 7

Emf (battery)

Answer 7

Forces electrons to move in the opposite direction of the E field

Question 8

Emf (battery)

Answer 8

Internal resistance

Question 9

True or False: While discharging, the terminal voltage of a battery can never be greater than the emf of the battery.

Answer 9

True

Question 10

Kirchhoff’s Rule #1

Answer 10

Junction rule: I = I1+I2

Question 11

Kirchhoff’s Rule #2

Answer 11

Loop rule: sum of the potential differences across elements in a closed circuit must be zero

battery goes A to B

current: -IR=V
NO current +IR=V

Question 12

RC Circuits (CE vs t: INCREASES)

Answer 12

After one time (T) constant, the charge is 63.2% of the max CE value

Question 13

RC Circuits (Q vs t: DECREASES)

Answer 13

The charge drops to 36.8% of its initial value when one time (T) constant has elapsed

Question 14

RC Circuits

Answer 14

The current STOPS when CAPACITORS charges up in circuit CANCELING RESISTORS IN LINE