DC Theory Lesson 5: DC Circuit Analysis Flashcards
Identify the two Kirchhoff’s Laws from the list below.
I. The algebraic sum of currents entering or leaving any junction is equal to 0.
II. The algebraic sum of power entering and leaving any junction is equal to 0.
III. The algebraic sum of resistance in a parallel circuit is equal to the total resistance.
IV. The algebraic sum of the voltage that drops around any closed path or loop is 0.
A: I and II
B: I and IV
C: II and III
D: III and IV
B: I and IV
Drag and drop labels next to the following drawings to indicate which analysis method or theorem they are associated with.
A: Norton’s Theorem
B: Thevenin’s Theorem
C: Kirchhoff’s Current Law
D: Superposition
(In order top to bottom)
* Superposition
* Kirchhoff’s Current Law
* Thevenin’s Theorem
* Norton’s Theorem
Identify the equation that proves Kirchhoff’s Voltage Law for the circuit shown given the following:
ES1 = 8 V, ES2 = 14 V, R1 = 12 Ω, R2= 10 Ω, R3 = 22 Ω, and IT = 0.5 A
Choose an answer:
A. 0 = 22 V − (3 V + 3 V − 12 V)
B. 0 = 22 V − (6 V + 5 V + 11 V)
C. 0 = 22 V − (5 V − 3 V + 13 V)
D. 0 = 22 V − (6 V − 5 V + 11 V)
B: 0 = 22 V − (6 V + 5 V + 11 V)
In a parallel circuit, the current through each resistor is (?) to its resistance.
A. added
B. directly proportional
C. equal
D. inversely proportional
D. inversely proportional
Thevenin’s Theorem states that (?)
A. any source can be reduced to an equivalent current source and an equivalent resistance
B. any source can be reduced to single equivalent voltage and an equivalent resistance in series
C. the algebraic sum of currents entering or leaving any junction is equal to zero
D. the algebraic sum of the voltage drops around any closed path or loop is zero
B. Any source can be reduced to single equivalent voltage and an equivalent resistance in series
Using the Law of Proportional Current, solve for IR1 in the circuit shown, given:
IT = 8 A, R1 = 268 Ω, and R2 = 416 Ω
(Round the FINAL answer to two decimal places.)
4.87
Mark the proper order for each of the following steps used in applying the Principle of Superposition by dragging the number and dropping it on the step.
A. Repeat this procedure for each power source in the circuit; determine the amount of the current and the direction of the current flow through the load.
B. Assume a direction of current flow through the load.
C. Select one power source and replace all the other power sources in the circuit with a short circuit.
D. Calculate the current flow for the selected source.
-Step 1
-Step 2
-Step 3
-Step 4
A: Step 4
B: Step 2
C: Step 1
D: Step 3
Norton’s Theorem states that (?)
A. any source can be reduced to a single equivalent voltage and an equivalent resistance in series
B. any source can be reduced to an equivalent current source and an equivalent resistance in parallel
C. the algebraic sum of currents entering or leaving any junction is equal to 0
D. the algebraic sum of the voltage drops around any closed path or loop is 0
B. any source can be reduced to an equivalent current source and an equivalent resistance in parallel
The formula** I2 = IT * (R1/(R1+R2)) **finds the (?) resistor R2 of a parallel circuit containing two resistors when the total circuit current and the individual resistances are known.
A. current through
B. power through
C. voltage of
D. wattage of
A. current through
According to the Law of Proportionality, if Resistor A in a series circuit has three times more resistance than Resistor B, then the voltage across Resistor A will have (?) the voltage drop compared to Resistor B.
A. 1/3
B. 2/3
C. 3 times
D. the same as
C. 3 times
In a series circuit, what two things are directly proportional?
A. The current across the load AND the value of the resistance of that load
B. The current across the load AND the voltage across the load
C. The value of the current of the load AND the wattage across that load
D. The voltage across the load AND the value of the resistance of that load
D. The voltage across the load AND the value of the resistance of that load
Use the Principle of Superposition to determine the absolute value of total current, in milliamperes, through R1 in the circuit below, given:
E1 = 38 V, E2 = 31 V, and R1 = 13 Ω
(Round your FINAL answer to a whole number.)
538
Drag and drop the following labels next to the following formulas to indicate which analysis method or theorem they are associated with.
- Norton’s Theorem
- Kirchhoff’s Voltage Law
- Kirchhoff’s Current Law
- Thevenin’s Theorem
According to the Law of Proportionality, if resistor A in a series circuit has 60 Ω of resistance and resistor B has 20 Ω of resistance, what is the voltage drop on resistor A if the applied voltage is 141 V?
(Round the FINAL answer to one decimal point.)
105.8
Using the Principle of Superposition, the total current will be ? the sum of the individual currents.
A. equal to
B. half of
C. less than
D. more than
A. equal to
Use Kirchhoff’s Voltage Law to solve for the voltage across resistor R2 in the circuit, given:
ET = 35 V and ER1 = 14 V
(Round the FINAL answer to two decimal places.)
21.00
Determine the current flow, in amperes, through a load resistor (RLoad) with a value of 9 Ω, given Thevenin’s Theorem’s equivalent circuit values:
RTH = 26 Ω and ETH = 120 V
(Round the FINAL answer to two decimal places.)
3.43
Kirchhoff’s Current Law states that the algebraic sum of ? .
A. currents entering and leaving any junction is equal to 0
B. power entering and leaving any junction is equal to 0
C. resistance in a parallel circuit is equal to the total resistance
D. the voltage drops around any closed path or loop is 0
A. currents entering and leaving any junction is equal to 0
According to the Laws of Proportionality, if a resistor in a parallel circuit has twice the resistance of a second resistor, it will have ? the current of the second resistor.
A. 1/4
B. 1/3
C. 3/4
D. 1/2
D. 1/2
The pictured formula is known as (?) .
A. Kirchhoff’s Law
B. the Law of Proportionality
C. Ohm’s Law
D. Watt’s Law
B. the Law of Proportionality
