Unit 11: Circuits (Series & Parallel)

A series circuit has 4 resistors connected to a 45.0 V potential difference. The resistors have resistances of 5.0 Ω, 8.0 Ω, 10.0 Ω, and 12.0 Ω. What is the total current flowing through the circuit? Round to the tenths.

1.3 amps

Four resistors having resistances of 20 Ω, 40 Ω, 60 Ω, and 80 Ω are connected in series across an ideal dc voltage source. If the current through this circuit is 0.50 A, what is the voltage of the voltage source?

100 V

A series circuit has 4 resistors connected to a 45.0 V potential difference. The resistors have resistances of 5.0 Ω, 8.0 Ω, 10.0 Ω, and 12.0 Ω. What is the drop in potential difference through the 10.0 Ω resistor?

13 V

A series circuit consists of a switch, a 6-V battery, a lightbulb, and some copper wire. Whenever the circuit is turned on, each of these elements has the same ________. A. current through it B. potential difference across it C. temperature D. resistance in it

A

Four unequal resistors are connected in a parallel with each other. Which one of the following statements is correct about this combination? A. The equivalent resistance is more than the largest resistance. B. The equivalent resistance is less than that of the smallest resistor. C. None of the other choices is correct. D. The equivalent resistance is equal to the average of the four resistances. E. The equivalent resistance is midway between the largest and smallest resistance.

B

How many paths through which charges can flow would be shown in a circuit diagram of a series circuit? A. zero B. one C. two or more

B

Three identical light bulbs are connected to a D-cell as shown below below. Which one of the following statements is true? A. The bulb between Y and Z will be the brightest. B. All three bulbs will have the same brightness. C. The bulb between X and Y will be the brightest. D. The bulb between Z and the battery will be the brightest.

B

Compare circuit X and Y shown below. Each is powered by a 12-volt battery. The voltage drop across the 12-ohm resistor in circuit Y is _______ the voltage drop across the single resistor in X. A. the same as B. larger than C. smaller than

C

Four unequal resistors are connected in series with each other. Which one of the following statements is correct about this combination? A. The equivalent resistance is equal to that of any one of the resistors. B. The equivalent resistance is less than that of the largest resistor. C. The equivalent resistance is more than the largest resistance. D. The equivalent resistance is less than that of the smallest resistor. E. The equivalent resistance is equal to average of the four resistances.

C

When unequal resistors are connected in series across an ideal battery_________. A. the potential difference across each is the same B. the voltage drop across each resistor is the same C. the current flowing in each is the same

C

The lamps in a string of 10 decorative lights are connected in parallel across a constant-voltage power source. What happens if one lamp burns out? A. The other lamps go out also. B. The other lamps get dimmer equally. C. The other lamps get brighter, but some get brighter than others. D. The brightness of the lamps will not change. E. The other lamps get brighter equally.

D

************ When unequal resistors are connected in parallel in a circuit ____. A. the power generated in each resistor is the same B. the largest resistance has the largest current through it C. the potential drop is always the same across each resistor D. the same current always runs through each resistor

NOT: A