Deck 8: Voltage Dividers and Current Dividers

Question 1

Any ______________ circuit is a voltage divider in which the individual resistor voltage drops are proportional to the series resistance values.

Answer 1

series

Question 2

Any ______________ circuit is a current divider in which the individual branch currents are inversely proportional to the branch resistance values.

Answer 2

parallel

Question 3

Series voltage drops are ______________ to the resistances.

Answer 3

proportional

Question 4

In a current divider, each branch current is ______________ proportional to its R.

Question 5

______________ is equal to 1 divided by R.

Question 6

The unit for conductance is ______________.

Question 7

In a ______________ circuit, the IR drops add to equal the applied voltage.

Question 8

In a voltage divider, all current in the circuit must come from the ______________.

Question 9

The current through all the resistances in a divider is the ______________ current.

Question 10

All current in a voltage divider must come from the

A) resistors
B) branch currents
C) loads
D) voltage source

Question 11

The bleeder current that flows through an entire divider is generally specified at about

A) 5% of the load current
B) 10% of the load current
C) 20% of the load current
D) 50% of the load current

Question 12

A loaded voltage divider is just a practical application of a

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

Question 13

Any series circuit in which the individual resistor voltage drops are proportional to the series resistance values is a(n)

A) balanced bridge
B) unbalanced bridge
C) current divider
D) voltage divider

Question 14

When parallel-connected loads are added to a series circuit, the circuit becomes a(n)

A) loaded voltage divider
B) balanced bridge
C) unloaded voltage divider
D) parallel resonant circuit

Question 15

In a series circuit, the voltage drops equal

A) the sum of I and R
B) the product of I times R
C) the power divided by voltage
D) the current times the applied voltage

Question 16

The series string can be considered a

A) bridge
B) parallel circuit
C) current divider
D) voltage divider

Question 17

A very large R in series with a much smaller R has a

A) negligible IR drop
B) considerable IR drop
C) no voltage drop
D) more current flowing through it

Question 18

In a series voltage divider, the points at which different voltages are available are called

A) nodes
B) joints
C) taps
D) tacks

Question 19

In a parallel circuit, currents

A) divide inversely as the branch resistances
B) divide proportionally as the branch currents
C) are always equal in all branches
D) are equal to power divided by R

Question 20

Conductance G is equal to

A) 1/T
B) R times S
C) 1/R
D) I squared R

Question 21

Conductance and current are

A) inversely proportional
B) directly proportional
C) not related in any way
D) both measured in amperes

Question 22

The unit for G is the

A) ohm
B) joule
C) coulomb
D) siemens

Question 23

What is the easiest method that can be used to determine current in a parallel circuit with three or more branches?

A) Method of conductances
B) Method of resistances
C) Kirchhoff's law
D) Thevenin's theorem

Question 24

What circuit is often used to tap off part of the applied voltage for a load that needs less than the applied voltage?

A) Bridge
B) Current divider
C) Voltage divider
D) Rectifier

Question 25

In a series circuit, the IR drops

A) add to equal the applied voltage
B) will cancel out
C) all equal zero
D) add to equal twice the applied voltage

Question 26

In a current divider with two branch resistances, the larger R

A) has more current
B) has less current
C) has more voltage
D) has less voltage

Question 27

The current divider formula can be used

A) with series circuits
B) for any number of branch resistances
C) only for two branch resistances
D) to solve for applied voltage

Question 28

The current divider formula can be used only for ______________ branch resistances.

A) 0
B) 1
C) 2
D) 3

Question 29

Any series circuit is a voltage divider in which the individual resistor voltage drops are proportional to the series resistance values.

Question 30

Any parallel circuit is a current divider in which the individual branch currents are directly proportional to the branch resistance values.

Question 31

In a series circuit, the voltage drops equal the product of I times R.

Question 32

A series string can be considered a voltage divider.

Question 33

Since series voltage drops are proportional to the resistances, a very small R in series with a much larger R has a considerably large IR drop.

Question 34

Some voltage dividers are configured with taps that provide different voltages from each tap.

Question 35

In a two branch, parallel circuit, once one current is calculated, the other can be found by adding the calculated current to the total current (I_T).

Question 36

With parallel branches, a lower resistance takes more branch current, equal to V/R.

Question 37

The current divider formula can be used only for two branch resistances.

Question 38

The voltage divider formula can be used for only two series resistances.

Question 39

Conductance and current are inversely proportional.

Question 40

The unit for G is the siemens.

Question 41

To determine the value of current in a parallel circuit, the method of conductances is easier to use than the method of resistances for three or more branches.

Question 42

A voltage divider is often used to tap off part of the applied voltage V_T for a load that needs less voltage than V_T.

Question 43

In a series voltage divider, the IR drops do not add up to equal the applied voltage.