electrical homestudy 2
A three-resistor circuit has a total power of 25 W. Two of the resistors dissipate 10W and 5W respectively. How much power does the third resistor dissipate?
10 W
A two-branch parallel circuit has a 30 ohm and a 15 ohm resistor. What is the total resistance?
10 ohms
A two-branch parallel circuit has 2A of current in one branch and 3A in the other branch. Which branch is considered to have the larger load?
3A
A two-resistor series circuit has an applied voltage of 100 V. The voltage across one of the resistors is 40 V. The voltage across the other resistor is
60 V
A three-branch parallel circuit has resistances of 22 k-ohms, 68 k-ohms, and 33 k-ohms connected to a 300V source. What is the total power of the circuit?
8.14 W
A three branch parallel circuit has resistors of 27 ohms, 56 ohms, and 15 ohms. What is the total resistance?
8.23 ohms
The two resistors in a series circuit have voltages of 25 V and 60 V. The applied voltage is
85 V
A series circuit has a total resistance of 240 ohms and a current flow of 4A. what is the applied voltage?
960V
A point which is a common connection for other parts of a circuit is called a _____point.
Earth ground
"The algebraic sum of the currents entering and leaving a point must equal zero" is which law?
Kirchhoff's current law
"The algebraic sum of the voltage sources and voltage drops in a closed circuit must equal zero" is which law?
Kirchhoff's voltage law
A connection of multiple current paths in a circuit is often called a
Node
Finding the values of voltage, current, resistance, and power in a series circuit can be found by using ___ law
Ohm's
During the solving of a combination circuit, it is necessary to simplify a parallel block to
One series resistor
In a series circuit, there are how many paths for current to flow?
Only one path
A simple parallel circuit is a circuit that contains
Only parallel elements
Circuits that have more than one path for current flow are
Parallel circuits
Of the formulas for finding the total resistance of parallel resistors, one formula will work for any number of resistors regardless of their value. This is the
Reciprocal formula
Once elements of a combination circuit are reduced, you can ___ the circuit as a simple circuit to solve the values in the circuit
Redraw
Solving combination circuits includes a step in which you ____the circuit to a simpler circuit
Reduce
In a parallel circuit, the voltage drop across any branch is the same as the ____ voltage
applied
A combination circuit is a circuit that contains
both series and parallel elements
A method for finding total resistance of parallel resistors is
reciprocal formula, resistors of equal value, product over sum
A series circuit has two resistors. the resistors dissipate 10 W and 15 W. What is the total power dissipation of the circuit?
25 W
In a circuit, three wires form a junction. The currents in two of the wires are 5 A and 12 A. The current in the other wire is
7 A or 17 A
In a series circuit, all voltage drops across all the resistors are ____ to determine the voltage applied to the circuit
Added
Powered circuit networks can be simplified down to an equivalent single current source and a single resistor in parallel with the source. This conversion is done in accordance with
Norton's Theorem
In a combination circuit, how should one identify the series and parallel elements?
Trace the current path
An electrical connection made by connecting to the frame of electrical equipment such as an automobile, is called a _____ ground
chassis ground
In a parallel circuit, load is defined such that an increase in _____ flow results in an increase of load
current
An example of the Reciprocal Formula to find the total resistance of a parallel circuit is
1/RT = 1/R1 + 1/R2 + 1/R3 + 1/RN
A parallel circuit is composed of two 60 ohm resistors. What is the total resistance?
30 ohms
A parallel circuit composed of a 150 ohm and a 270 ohm resistor has a voltage of 120V. What is the current in the 150 ohm resistor?
0.8A
A parallel circuit composed of a 10 ohm and a 22 ohm resistor. It has a supply voltage of 60 V. What is the current in the 10 ohm resistor?
6 A
In a parallel circuit, the current through each branch is inversely proportional to the resistance of the branch. Because of this, parallel circuits are sometimes called
Current dividers
Which of the following formulas from the general voltage divider formula is used to determine the voltage drop across any series component?
Ex = (Et/Rt) Rx
In a parallel circuit, the total current flow is equal to the ____ of the currents through all the branches
Sum
Powered circuit networks with more than one source can be simplified by a process that involves solving the circuit using only one source at a time. This simplification is done in accordance with
The Superposition theorem
Powered circuit networks can be simplified down to an equivalent single voltage source and a single series resistor. This conversion is done in accordance with
Thevenin's theorem
The amount of ___ across a resistor is proportional to its resistance
Voltage drop
Kirchhoff's two laws are concerned with
Voltages around a closed loop and currents entering and leaving a point
The total power used in a circuit is equal to the...
Sum of the power used by all parts
In a series circuit, the resistors have a voltage drop across them that are proportional to their resistance values. If connections are made to various points in the circuit, different voltages can be obtained. This circuit is called a
voltage divider
A series circuit has a total resistance of 180 ohms and an applied voltage of 120 V. What is the current flow
0.667 A
If a series circuit has resistor values of 27 ohms, 56 ohms, and 82 ohms, the total resistance is
165 ohms
In a circuit, three wires form a junction. The currents in two of the wires are 5 A and 12 A and are flowing toward the junction. The current in the other wire is
17 A
A 62 k-ohm and an 82 k-ohm resistor are connected in parallel. They have a supply voltage of 480 V. What is the power of the 82 k-ohm resistor?
2.81 W
A three-branch parallel circuit has a total resistance of 385.83 ohms. Two of the resistors are 680 ohms and 1500 ohms. What is the value of the third resistor?
2200 ohms
A parallel circuit composed of a 120 ohm and a 220 ohm resistor has a supply voltage of 240 V. What is the total circuit current?
3.091 A
In a parallel circuit, several resistors are connected to a single power source. Each separate resistor circuit is called a
Circuit branch
Two devices that are designed to open and disconnect a circuit in the event of excessive current are
Circuit breakers and fuses
A series circuit is a circuit that has only one path for ____flow
Current
An increase in ____ results in an increase of load in a parallel circuit
Current
In a parallel circuit, the total resistance is always ___ resistance of the lowest value resistor
Less than
In a parallel circuit, an increase in current flow in a branch results in an increase of the ____ of the branch
Load
The three formulas used to determine resistance in a parallel circuit are called
Resistors of Equal Value, Product Over Sum, Reciprocal Formula
In a series circuit the current is ____at any point in the circuit
The same
All parallel circuits are considered...
current dividers
The polarity of the voltage across a resistor depends on the direction of current flow through the resistor. The end of the resistor into which current enters is assigned the polarity of
negative
In a parallel circuit, the total current flow in the circuit is equal to the ____ of the currents through all the branches
sum
In a series circuit with two resistors, the total resistance is equal to the ___ of the two resistors.
sum
In a circuit, three wires form a junction. the current in one of the wires is
the sum of the currents in the other two wires; and the difference between the currents of the other two wires
An electrical connection made by connecting to a rod or pipe physically driven into the ground is called a ____ground
Earth
