Deck 6: Parallel Circuits

Question 1

The reciprocal of resistance is ______________.

Answer 1

conductance

Question 2

The base unit of conductance is the ______________.

Answer 2

siemen

Question 3

Total power equals the ______________ of the individual values of power in each branch.

Answer 3

sum

Question 4

If the total current and one branch current of a two branch parallel circuit is known, the other branch current can be found by ______________ the known branch current from the total current.

Question 5

If one branch of a parallel circuit becomes shorted, all branches are effectively ______________.

Question 6

A ______________ circuit has practically zero resistance.

Question 7

The applied ______________ remains present across all branches whether they are open or not.

Question 8

A ______________ is a safety device used to protect circuit components.

Question 9

The voltage across a(n) ______________ in a series circuit equals the applied voltage.

Question 10

The base unit for conductance is the

A) joule
B) coulomb
C) siemen
D) watt

Question 11

In a parallel circuit, total power equals

A) the sum of the individual values of power in each branch
B) the power of any one branch
C) the total resistance times the total voltage
D) the total voltage divided by the total resistance

Question 12

In a parallel circuit, if the voltage is known across one branch, this voltage is

A) one-half of the voltage across all other branches
B) twice the voltage across all other branches
C) split between all other branches
D) across all the branches

Question 13

What would happen to the branch currents in a parallel circuit if one of the branches became short-circuited?

A) Currents would increase slightly
B) Currents would be maximum
C) Currents would decrease to zero
D) Currents would decrease slightly

Question 14

The current in an open branch of a parallel circuit is

A) zero
B) maximum
C) voltage divided by resistance
D) equal to current in other branches

Question 15

A device which serves to protect the circuit components and wiring in the event of a short circuit is a

A) varactor
B) resistor
C) silicon diode
D) fuse

Question 16

With power removed from a shorted parallel circuit, what will an ohmmeter measure across all branches?

A) Infinity ohms
B) Zero ohms
C) 150 ohms
D) 1000 ohms

Question 17

The voltage across an open in a series circuit equals

A) zero volts
B) current times resistance
C) the applied voltage
D) the applied voltage minus all other series connected voltage drops

Question 18

Any circuit that provides one common voltage across all components is a

A) parallel circuit
B) series circuit
C) series-parallel circuit
D) short circuit

Question 19

In a parallel circuit, the total current supplied by the applied voltage must equal

A) the current through any one branch
B) the sum of all individual branch currents
C) the applied voltage divided by any one branch resistance
D) applied voltage divided by total branch power

Question 20

When two or more components are connected across a voltage source a

A) series circuit is formed
B) series-parallel circuit is formed
C) parallel circuit is formed
D) short circuit is formed

Question 21

Typical house wiring is a common application of

A) parallel circuits
B) series circuits
C) series-parallel circuits
D) dc circuits

Question 22

In a parallel circuit, the branch with the highest resistance always has the

A) most current
B) least current
C) most power
D) most energy

Question 23

As more branches are added to a parallel circuit

A) total resistance increases
B) branch resistances increase
C) total current increases
D) total voltage increases

Question 24

An advantage of having only one pair of connecting leads to the source for all the parallel branches is that usually

A) more power is dissipated
B) less power is dissipated
C) more wire is necessary
D) less wire is necessary

Question 25

The pair of leads connecting all the branches to the terminals of the voltage source is the

A) main line
B) mine line
C) twin leads
D) darlington pair

Question 26

Whose law states that the total current in the main line in a parallel circuit equals the sum of the individual branch currents?

A) Ohm
B) Lenz
C) Kirchhoff
D) Fourier

Question 27

The combined equivalent resistance across the main line in a parallel circuit can be found by using

A) Ohm's law
B) Kirchhoff's law
C) Lenz's rule
D) Fourier's analysis

Question 28

A combination of parallel branches is often called a

A) patch
B) loop
C) bank
D) prototype

Question 29

Putting more resistance into a parallel circuit

A) lowers the equivalent resistance
B) raises the equivalent resistance
C) increases the applied voltage
D) decreases total power

Question 30

If the resistance is equal in all parallel branches, the combined equivalent resistance equals the

A) applied voltage divided by total current
B) sum of all resistances
C) sum of all conductances
D) value of one branch resistance divided by the number of branches

Question 31

With power removed from a short-circuited parallel circuit, an ohmmeter will measure ______________ ohms across all the branches.

A) 0
B) 1
C) 2
D) none of these are correct

Question 32

The total current in a parallel circuit must equal the sum of all individual branch currents.

Question 33

A parallel circuit is formed when one or more components are connected in series with a voltage source.

Question 34

A common application of parallel circuits is typical house wiring to the power line.

Question 35

In a parallel circuit, the branch with the lowest resistance always has the least current.

Question 36

Components to be connected in parallel are usually wired directly across each other, with the entire parallel combination connected to the voltage source.

Question 37

In a parallel circuit, the pair of leads connecting all the branches to the terminals of the voltage source is the main line.

Question 38

Kirchhoff's current law states that the total current in the main line in a parallel circuit equals the sum of the individual branch currents.

Question 39

When a parallel circuit has two branch currents, one branch must equal the total circuit current.

Question 40

The combined equivalent resistance across the main line in a parallel circuit can be found by dividing the common voltage across the parallel resistances by the total current of all branches.

Question 41

A combination of parallel branches is often called a bank.

Question 42

The reciprocal resistance formula is derived from the fact that total current is the sum of all the branch currents.

Question 43

If resistance is equal in all branches, the combined equivalent resistance equals the value of one branch resistance divided by the number of branches.

Question 44

When there are two parallel resistances and they are not equal, it is usually quicker to calculate the combined resistance by finding their sum and dividing that by their product.

Question 45

A parallel circuit is any circuit that provides one common voltage across all components.