All Test Answers (131)
What applied voltage will cause a 20 ohm resistor to dissipate 5 W
10 V
What voltage would cause 20 A of current to flow through a 500 ohm resistor?
10 k V
How much power is dissipated by a light bulb if the voltage applied is 12 v and its resistance is 12 ohms?
12 W
What is the total resistance of 15 8 ohm resistors connected in series?
120 ohms
How much power is dissipated by a circuit with 15000 ohm of resistance and 10 mA of current
15 W
What is the total dissipated power from 2 100 W lamps
200W
The value (12 x 10^-3) + (1 x 10^-4) equals:
22 x 10^-3
What maximum power will a 100 ohm resistor dissipate when connected to a 50 V supply
25 W
How much power does a 50 V amplifier use when it draws 5. 0 A of current?
250 W
A series circuit with a voltage source of 15 V and a total resistance of 7500 ohms will dissipate how much power?
30 W
What voltage is developed across a 330 resistor if 100 mA of current flows through it
33 V
A certain resistor color code is RED-RED-RED-GOLD. If this resistor was connected across the terminals of a 12 volt car battery, what current would flow through the resistor?
5.45 mA
Expressed as a power of 10, the number 0.0006 is the same as:
6.0 x 10^-4
If the total voltage applied in a series circuit is 120 V and the voltage drop across R1 is 20 V and R2 drops 30 V, what is the voltage drop for R3?
70 V
Convert 0.072 W to mW
72 mW
4 470 +-5% resistors are measured with an ohmmeter. One of the measured resistor values is not within the +-5% tolerance. Which of the following readings is out of bounds: A) 445.0 B) 490.0 C) 470.6 D)476.0
A
The color bands blue, gray, brown, and gold describe which one of these resistors: A) 680 +- 10% B) 680 +- 5% C) 68 +- 5% D) 68 +- 10%
B
Which of the following is the correct formula for voltage in Ohm's Law: A) E = I / R B) E = I + R C) E = IR D) E = R / I
C
The material with the fewest free electrons are classified as:
Conductors
According to ohm's law, which of the following is directly proportional to voltage if resistance is kept constant
Current
An ammeter is designed to measure:
Current
The rate of flow of free electrons in a conductive material is called:
Current
Which one of these statements is TRUE of 2+ current sources in parallel: A) The magnitude of the combined current is always less than the smallest individual current B) they violate Kirchoff's current law C) A series resistor must be included in each branch D) They can be replaced by one current source
D
A series circuit has the same voltage across every component
F
An ideal current source has a 0 ohm resistance in parallel with it
F
An ideal voltage source has an infinite resistance in series with it
F
An ideal voltage source has infinite internal resistance
F
An instrument designed to measure current is called a voltmeter
F
Current flowing from a battery is measured by placing an ammeter across the battery terminals
F
Current sources of different amplitudes can be connected in series
F
The SI prefix pico is equal to 10^12
F
The copper atom contains 29 free electrons
F
The notion |uA is an abbreviation for nanoamp
F
The power dissipated by a resistor doubles if the applied voltage doubles
F
The product of all the voltage drops in a series circuit will equal the source voltage
F
The superposition principle is applicable to power effects because the power loss in a resistor varies as a function of the square of the current through it
F
To perform a conversion from one type of source to another, a voltage source must have a resistor in parallel with it and a current source must have a resistor in series
F
Under maximum power transfer conditions, the operating efficiency of a system is 100%
F
Voltage divider rule is a method by which current in a series circuit can be determined without first calculating the voltage in a circuit
F
When a 10 k resistor, a 1 k resistor, and a 100 ohm resistor are connected in series, the voltage across each resistor is the same
F
When using the superposition theorem, each ideal voltage and current source must be replaced by an open circuit:
F
While using superposition theorem, a voltage source is replaced be an open circuit
F
While using superposition theorem, a voltage source is replaced by an open circuit
F
What is the equivalent current source when VS = 1.2 V and RS = 0.4 ohms
IS = 3. 0 A, RS = 0. 4 ohms
If the voltage drop across a resistor increases by a factor of 10, the power dissipated by the resistor:
Increases by a factor of 100
To measure voltage drops in a series circuit, a voltmeter should be connected in
Parallel only
In double-subscript notation Vab = + 7 V denotes:
Point A is 7 V more positive than point b
The maximum amount of power a resistor can safely handle without damage is called:
Power rating
A 1000 w load that operates for one hour consumes the same amount of energy as a 100 w load that operates for 10 hours
T
A ladder network is a cascaded set of series-parallel combinations that has the appearance of a ladder
T
A loop current source is a branch current only when it is the only loop current assigned to that branch
T
A mathematical relationship between current, voltage, and resistance was determined by George Ohm
T
A node is defined as a junction of 2+ branches
T
Ammeters are always placed in series with the branch in order to measure the current
T
Ammeters are always placed in series with the branch in which the current is measured
T
An ohmmeter is used to detect open-circuit and short-circuit situations
T
Any node including the effect of elements tied only to other nodes is referred to as a supernode
T
Each resistor in a parallel circuit demands a current (I = V/R), and is independent of all other resistors in parallel with it
T
Efficiency is determined by dividing the power output by the power input
T
Elements that are good conductors usually have only one electron in the valence ring
T
For any physical network, the value of Eth can be determined experimentally by measuring the open-circuit voltage across the load terminals
T
From the application of Kirchoff's voltage law around a closed loop, the polarity of a voltage source is unaffected by the direction of the assigned loop current
T
Ground is a common reference point in a circuit
T
Ohm's law is named in honor of Georg Simon Ohm
T
Ohm's law shows that current is directly proportional to the applied voltage and is inversely proportional to resistance
T
Polarity is defined based on the conventional current through a resistive element
T
Power is equal to the resistance times the current squared
T
Resistance is directly proportional to the length of a conductor
T
The Norton and Thevenin equivalent circuits can be found from each other by using source transformation
T
The current entering a point in a circuit is equal to current leaving the point
T
The current entering a point in a circuit is equal to the current leaving the point
T
The current that flows through series elements of a circuit is the same in each element
T
The efficiency of a system is defined by the ratio of power delivered to the load of all the power supplied by the source
T
The notion |us is an abbreviation for micro second
T
The power dissipated by a resistor doubles if the applied voltage doubles
T
The resistance calculated using Norton's Theorem is equal to the resistance calculated using Thevenin's Theorem for the same electrical network
T
The sum of the voltage drops in a series circuit is always equal to the applied voltage
T
The superposition theorem is used to simplify circuit analysis where 2+ sources are present
T
The total resistance in a series circuit is equal to the sum of the individual resistance levels
T
Thevenin's Theorem is used to simplify complex networks to a simple voltage source with its source resistance
T
Thevenin's Theorem permits the reduction of any 2 terminal linear DC network to one having a single voltage source and a series resistor
T
Thevenin's Theorem permits the reduction of any 2-terminal linear dc network to one having a single voltage source and a series resistor
T
Troubleshooting is the process of identifying and locating a fault in a circuit
T
When 2+ components are connected across the same voltage source, they are in parallel
T
When using loop analysis, it is recommended that each loop be drawn in a clockwise direction
T
When using the power often, moving the decimal point to the right indicates a positive power of ten
T
When using the powers of ten, 1 x 10^-3 would be a larger number than 1 x 10^-6
T
Kirchoff's Voltage Law (KVL) states:
The algebraic sum of the potential rises and drops around a closed loop is 0
Kirchoff's Voltage Law (KVL) states:
The algebraic sum of the potential rises and drops around a closed loop is zero
When using the superposition theorem on a 2 source network, if the current produced by one source is in one direction, while that produced by the other source is in the opposite direction through the same resistor,
The resulting current is the difference of the two and has the direction of the larger current
Kirchoff's Current Law states that:
The sum of the currents entering a junction must equal the sum of the currents leaving the junction
Power is measured in:
Watts (W)
The sum of the series IR drops around a closed loop must:
equal the applied voltage
In double-subscript notation, Vab = + 7 V denotes that:
point a is 7 V mores positive than point b
EXAM 2
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Practice Quiz (Exam 1)
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PRACTICE EXAM 2
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EXAM 3
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EXAM 1
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