ECET 201 Midterm
A four-color resistor has the color-code red-violet-orange-gold. If it is placed across a 12 V source, the expected current is
0.44 mA
The smallest power rating you should use for a resistor that is 330 W with 12 V across it is
1/2 W
A battery rated for 20 Ah can supply 2 A for a minimum of
10 hours
The power dissipated by a light operating on 12 V that has 3 A of current is
36 W
If the current in a 330 W resistor is 15 mA, the applied voltage is approximately
5.0 V
A four-color resistor with the color bands gray-red-black-gold is
82
The unit of measurement for current is the:
AMP
A series circuit has the same voltage across every component
False
A series connection provides two or more paths for current to flow
False
A short could best be described as a unintended path for voltage
False
An electronic device which stores an electric charge is known as an inductor
False
Assembly diagrams show how to connect components electrically
False
Efficiency is determined by dividing the power output by the power input
False
Electrons are negatively charged particles, and are contained in the nucleus of the atom
False
If 50 Joules are used in ten seconds, the power will be 500 Watts
False
In a series circuit, current is not the same when measured at different points in the circuit
False
Increasing voltage while maintaining the same resistance will cause current to decrease
False
Inductors store energy in an electrostatic field
False
Observed voltages not being shared identify components in parallel in a series-parallel
False
Resistors normally short when they burn out
False
The copper atom contains 29 free electrons
False
The movement of electrons between two points is called voltage
False
The nucleus contains protons and electrons, each with an opposite charge
False
The power dissipated by a resistor doubles if the applied voltage doubles
False
The process of gaining a valence electron is known as ionization
False
The product of all the voltage drops in a series circuit will equal source voltage
False
The total resistance of a series circuit is equal to the average of all the resistance values
False
The unit of measurement for conductance is the coulomb
False
The voltage across a circuit resistance is inversely related to the current through that resistance
False
Voltage forces electrical energy through a circuit
False
When a load resistor is connected across a voltage divider output, the output voltage increases
False
A mathematical relationship between current, voltage, and resistance was determined by
George Ohm
The symbol for current is:
I
The SI unit of energy is the
Joule
The symbol for power is:
P
The symbol for charge is
Q
If the voltage in a resistive circuit is doubled, the power will be
Quadrupled
A 1 kW load that operates for 1 hour consumes the same amount of energy as a 100 W load that operates for 10 hours
True
A change in voltage will result in a linearly proportional change in current
True
A junction is any point in a circuit where two or more circuit paths come together
True
A loaded voltage divider is a common application of a series-parallel circuit
True
A parallel circuit is also used as a current divider
True
A parallel connection provides two or more paths for current to flow
True
A series-parallel circuit is a combination of both series and parallel paths
True
A voltage divider is a series arrangement of resistors
True
As you add resistors to a series circuit, total current will decrease
True
Current value depends on the amount of charge moving past a point in a unit of time
True
Each resistor in a parallel circuit demands a current (I = V/R), and is independent of all other resistors in parallel with it.
True
Energy is the ability to do work
True
Ground is a common reference point in a circuit
True
If one of the resistors opens in a parallel circuit, total resistance of the circuit will increase
True
In the neutral state all atoms contain the same number of protons and electrons
True
Kilo equals 1,000 times the base unit
True
One watt equals one joule per second
True
Open circuits and short circuits are typical circuit
True
Parallel components in a series-parallel circuit may be in parallel with other individual components, or with other combinations of components
True
Power is the rate at which energy is used
True
Series components in a series-parallel circuit may be in series with other components, or with other combinations of components
True
The current entering a point in a circuit is equal to the current leaving the point
True
The outermost shell of an atom is called the valence shell
True
The rate at which work is performed is called power
True
The smallest particle of an element that still retains the characteristics of the element is called an atom.
True
The symbol μ is an abbreviation for 10-6 or micro
True
The total (equivalent) resistance in a parallel circuit is always less than the lowest value resistor
True
The total power taken from the power supply, and dissipated by the resistors in a parallel circuit, is the sum of the powers dissipated by each resistor in the circuit
True
The voltage drop across each resistance in a parallel circuit is equal to the supply voltage
True
Troubleshooting is the process of identifying and locating a fault in a circuit
True
Valence electrons are tightly bound in insulators
True
When parallel resistors are of three different values, the smallest resistor will dissipate the greatest amount of power
True
When two or more components are connected across the same voltage source, they are in parallel
True
The symbol for voltage is:
V
If three equal resistors are in series, the total resistance is
WHO ****ING KNOWS
A unit of power is the
Watt
In a series circuit with more than one resistor, the current is
always the same in all resistors
The circular mil is a unit of
area
A battery stores
chemical energy
The atomic particle responsible for electrical current in solid metallic conductors is that
electron
Valence electrons are
electrons in the outermost shell involved in chemical reactions loosely bound
In any circuit the total current entering a junction is
equal to the total current leaving the junction
The current in a certain 4-band resistor is 22 mA when the voltage is 18 V. The color bands on the resistor are
gray-red-brown-gold
A troubleshooting method that starts in the middle and works toward a fault is
half-splitting
For constant voltage in a circuit, doubling the resistance means
halving the current
Holding the voltage constant, and plotting the current against the resistance as resistance is varied will form a
hyperbola
In a closed loop, the algebraic sum of all voltages (both sources and drops)
is zero
In a series circuit with more than one resistor, the voltage is
larger across larger resistors
A series circuit cannot have
more than one path
If three equal resistors are in parallel, the total resistance is
one third the value of one resistor
A 330kW+- 5% resistor has the color bands
orange-orange-yellow-gold
The efficiency of a power supply is determined by
output power divided by input power
The atomic number is the number of
protons in the nucleus
Two circuits that are equivalent have the same
response to an electrical stimulus
The unit of conductance is the
siemen
When the current is plotted against the voltage for a fixed resistor, the plot is a
straight line with a positive slope
The total power dissipated in a parallel circuit is equal to the
sum of the power in all resistors
The total power dissipated in a series circuit is equal to the
sum of the power in all resistors
The power rating of a resistor is determined mainly by
surface area
Before troubleshooting a faulty circuit you should find out
the conditions that existed when it failed the symptoms of the failure if the circuit ever worked
The total resistance of parallel resistors is equal to
the sum of the reciprocals of the resistances
If a series equivalent circuit is drawn for a complex circuit, the equivalent circuit can be analyzed with
the voltage divider theorem
The number of nodes in a parallel circuit is
two nodes
