Concepts of DC Final 4-6
Resistors of 10,40,and 8 ohms are in parallel what's the total conductance?
.250S
With power removed from a shorted parallel circuit an ohmmeter will measure what across all branches
0 ohms
How much is the voltage across a shorted component in a series circuit
0V
V1 of 25V is series opposing with V2 of 25V what's the total voltage?
0V
10V/10k ohms is equal to:
1mA
A series circuit with an applied voltage of 12V contains a 10 ohm resistor and a 50 ohm resistor, what will the current value be:
200mA
A 12ohm and an 18ohm resistor are in series. The current flow is 150mA how much voltage exists
4.5V
V1 of 25V is series aiding with V2 of 25V what is the total voltage
50V
Three 18ohm resistors are in parallel what's the Req?
6 ohms
80v is applied over 2 resistors in series of V1=20V how much is V2
60V
A series circuit containing resistance values of 10, 20, and 30 ohms has a total resistance value of:
60ohms 10+20+30
A 56ohm and 82ohm resistor are in series with an unknown resistor if Rt is 200ohms what is the value of the unknown resistor
62ohms
A 120k ohm resistor and a 180k ohm are in parallel what's the Req?
72k ohms
Series circuit has voltage drops of 20V, 25V, and 30V. How much is the total applied voltage?
75V
Series circuit has applied voltage of 10v, R1=3 ohms R2= 7ohms and total current of 1 amp. What is the voltage drop across R2?
7V
Two 2.2k resistors are in parallel what's the Voltage applied of the current is 7.5mA
8.25 volts
In series circuits with the same current through all resistors the largest resistance must have the:
Largest IR voltage drop across it
What's the equation for total power in a series circuit.
Pt=P1+P2+P3 Vt x I I squared x Rt
A 2k ohm and 30k ohm resistor are in series with a 60v source which dissipates less power?
R1
In a series parallel circuit if Rt is to be determined which of the following formulas should be used
Rt=Vt/It
How many parallel strings can be in a series parallel circuit:
any number
There can be more than two parallel resistances in a bank and:
any number of banks in a series
Each path for current is a parallel circuit is called a
branch
To find the resistance of an entire series parallel circuit:
combine parallel resistances in each bank and add the series resistances
The reciprocal of resistance is
conductance
What would happen to the branch currents in a parallel circuit if one of the branches became shorted
currents decrease to zero
The term trouble shoot means to:
diagnose or analyze
The power in a parallel circuit is equal to the sum of the power________by the individual resistance of the parallel branches.
dissipated
Branch current equals the voltage applied across the branch
divided by total resistance in the branch
The Req of a parallel circuit may be found by _______ the common voltage across all resistances (by, to, from) the total current of the branches.
dividing
A short circuit has an extremely high resistance path for current flow
false
A short circuit has infinite resistance
false
Components to be connected in parallel are not usually wired directly across each other, With the entire parallel combination connected to the voltage source.
false
Current is the same in all parts of a series circuit except when more than one resistor is used.
false
If resistance is not equal in all branches the combined equivalent resistance equals the value of one branch resistance divided by the number of branches
false
In a parallel circuit the branch with the lowest resistance always has the least current
false
Kirchhoffs current law states total current in the main line in a parallel circuit equals the product of the individual branch currents.
false
Removing one branch from a parallel circuit causes the total current to increase because there is less resistance in the circuit
false
The total current in a series circuit must equal the sum of all individual branch currents
false
There can be only two parallel strings and only one series resistance in a string
false
There cannot be more than two parallel resistances in a bank and any number of banks in series
false
Total current is equal to total voltage multiplied by total resistance:
false
Electron flow
flows from negative to positive
If one branch of a parallel circuit is shorted
fusee will blow and all other lines are shorted
When a parallel path contains series resistors both resistors :
have the same current
The total power needed to produce current in each series resistor in a series circuit is used up in the form of
heat
The measurement of a resistance in an open circuit is:
infinite
In a parallel circuit the branch with the highest resistance always has the:
least current
The equivalent resistance of a parallel circuit must be _____ than the smallest branch resistance.
less
Putting more resistance into a parallel circuit
lowers equivalent resistance
The pair of leads connecting all the branches to a voltage source is the
main line
The pair of leads connecting all the branches to the terminals of the voltage source is the
main line
In electron flow what is the polarity of a voltage drop across a resistor?
negative where electrons enter and positive where they exit
If one branch in a parallel circuit opens the:
other branch currents remain the same
Components that are in one current path without any branch points are in:
series
Any circuit that combines both series and parallel connections is a
series parallel circuit
What type circuit is used when it is necessary to obtain different voltage and current values from a single supply voltage
series-parallel
The base unit for conductance is the
siemen
When series resistors are connected in parallel the series resistors form a
string
For any one resistance in a string the current in the string multiplied by the resistance equals the
the IR drop across that particular resistance
The voltage across an open in a series circuit equals
the applied voltage
Electrically isolates means:
the resistance between each ground is infinite ohms
Series components can be defined as those in:
the same current path
Kirchhoffs voltage law states that:
the sum of all voltage drops in a series equals applied voltage
The sum of the branch currents for all parallel strings equals the:
total current
As more branches are added to a parallel circuit
total current increases
A combination of parallel branches is often called a bank
true
A short within a series parallel circuit does not necessarily mean that the circuit will draw excessive current from the voltage source.
true
Adding parallel resistances decreases the total equivalent resistances
true
Components can be connected in parallel even if they are not connected to a voltage source
true
Current is the movement of electric charge between two points produced by the applied voltage.
true
In parallel circuit the pair of leads connecting all the branches to the terminals of the voltage source is the main line
true
Series aiding voltages are added
true
Series opposing voltages are subtracted
true
The current in an open circuit is zero in all components
true
The sum of the series IR drops in the string equals the voltage across the entire string
true
Voltage polarity describes the positive and negative ends of a potential difference across a component such as a resistor
true
When parallel bank exists in a series path, both resistors have the same voltage but the individual branch currents are less than the series current
true
When a parallel bank exists in a series path both resistors have the same
voltage
If the fuse in the main line of a parallel circuit opens
voltage and currents will be zero
The current in an open branch of a parallel circuit is
zero
A short circuit in a branch of a parallel circuit has
zero resistance
