Deck 7: Parallel Circuits

Question 1

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

Answer 1

B

Question 2

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

Answer 2

C

Question 3

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

Answer 3

applied

Question 4

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

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

Question 5

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

A) parallel
B) series
C) combination

Question 6

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 7

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 8

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

Question 9

Parallel circuits are also referred to as _____.

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

Question 10

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 11

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 12

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

Question 13

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

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

Question 14

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 15

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

Question 16

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 17

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

Question 18

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 19

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