Deck 7: Parallel Circuits

Question 1

A method for finding total resistance of parallel resistors is _____.

A) product over sum
B) reciprocal formula
C) resistors of equal value
D) all of the above

Answer 1

D

Question 2

The term "load" refers to the amount of _____ in a circuit branch.

A) current
B) resistance
C) voltage
D) wattage

Answer 2

A

Question 3

An increase in _____, not resistance, results in an increase of load.

A) power
B) current
C) voltage
D) wattage

Answer 3

B

Question 4

Most devices such as light receptacles in homes and office buildings are connected in _______________ circuits.

Question 5

A parallel circuit is composed of two 60 Ω resistors. What is the total resistance?

A) 1 Ω
B) 3600 Ω
C) 120 Ω
D) 30 Ω

Question 6

A three branch parallel circuit has resistors of 27 Ω , 56 Ω , and 15 Ω . What is the total resistance?

A) 9.64 Ω
B) 98 Ω
C) 18.22 Ω
D) 8.23 Ω

Question 7

To calculate current flow through any branch of a circuit by substituting the values of I_X and R_X for the branch values when total circuit current and the resistance are known, use t he _______________ formula.

Question 8

Circuits that have more than one path for current flow are _____ circuits.

A) parallel
B) series
C) combination

Question 9

A two-branch parallel circuit has a 30 Ω and a 15 Ω resistor. What is the total resistance?

A) 2 Ω
B) 10 Ω
C) 45 Ω
D) 15 Ω

Question 10

In a parallel circuit, the total current flow is equal to the _____ of the currents through all the branches.

A) difference
B) average
C) sum
D) quotient

Question 11

Imagine a water system with a holding tank, pump, and return lines. What would happen to the resistance to flow if a return path is added to the system?

A) It increases
B) It lessens
C) It stays the same

Question 12

The voltage drop across any branch of a parallel circuit is the same as _______________ voltage.

Question 13

In a parallel circuit, the total resistance is _____ value resistor.

A) larger than the lowest
B) less than the lowest
C) equal to the largest
D) equal to the lowest

Question 14

A parallel circuit composed of a 10 Ω and a 22 Ω resistor. It has a voltage of 60 V. What is the current in the 10 Ω resistor?

A) 6 A
B) 5 A
C) 2.73 A
D) 1.88 A

Question 15

A three-branch parallel circuit has a total resistance of 385.83 Ω . Two of the resistors are 680 Ω and 1500 Ω . What is the value of the third resistor?

A) 2180 Ω
B) 2200 Ω
C) 467.89 Ω
D) 246.16 Ω

Question 16

Parallel circuits are also referred to as _____.

A) current dividers
B) current multipliers
C) voltage dividers
D) voltage multipliers

Question 17

A parallel circuit composed of a 150 Ω and a 270 Ω resistor has a voltage of 120 V. What is the current in the 150 Ω resistor?

A) 0.29 A
B) 0.8 A
C) 1 A
D) 0.44 A

Question 18

The amount of current flowing through each resistor is directly proportional to its resistance.

Question 19

In a parallel circuit, the voltage across each branch must be _______________.