AC/DC Finals Part 1 CH 6-10
True
A short-circuited branch circuit has a resistance of zero.
False
A voltage multiplier is a circuit made of resistors connected in series to produce a desired voltage drop across the resistors.
False
An open circuit is the same as a series circuit in that any open point in the circuit causes electron flow to stop.
True
Certain types of electronic systems require both a positive and a negative source of voltage for proper operation.
True
Conductance is improved and resistance reduced when adding resistors in parallel.
current
Current distribution in parallel-connected circuits equals the sum of the ____________________ through all branch circuits.
series
Current has the same value at any point in a(n) ____________________ circuit.
electrons
Current is the flow of ____________________ through an electrical circuit.
double
Doubling the number of conductors in parallel will ___ the electron flow in a circuit.
True
Efficiency of a circuit can be determined by dividing the power at the load by the total power output.
open
Electron flow is interrupted in a(n) ____________________ circuit.
True
Electrons have bodies that can be counted.
True
Heat is produced when electrons flow through a wire that has resistance.
power
Maximum ___ transfer between a source and load depends on the load resistance matching the source resistance.
False
More power is produced when a load's resistance is high or its applied voltage is low.
False
Not all sources of electrical potential have internal resistance.
voltage
Ohm's law can be used to calculate the ____________________ drop across any resistor.
False
Ohm's law can be used to calculate total circuit voltage and current, but not total circuit resistance.
False
Opening a series circuit at any point will increase the flow of electrons.
True
Parallel circuits are used when a constant current flow from a voltage source is needed.
False
Power is measured in ohms.
True
Resistors are available with a variety of power ratings.
False
Some electrical sources have no internal resistance.
3
The National Electrical Code® suggests that conductors be sized so that they do not reduce the voltage at the load by more than ____________________% of the source voltage.
200
The actual voltage of a 208 V circuit with a load resistance of 25 Ω and load current of 8 A is ___ V.
7.21
The total current in a parallel circuit that has 208 V applied to it and produces 1500 W of power is ___ A.
120
The total power in a circuit if six loads are connected in series and each load produces 20 W is ___ W.
5.1
The total resistance in a circuit containing resistors of 10 Ω, 15 Ω, and 35 Ω connected in parallel is ___ Ω.
0.98
The total resistance in a circuit containing resistors of 2 Ω, 3 Ω, and 5 Ω connected in parallel is ___ Ω.
1.875
The total resistance in a circuit containing resistors of 3 Ω and 5 Ω connected in parallel is ___ Ω.
6.06
The total resistance in a circuit containing resistors of 8 Ω and 25 Ω connected in parallel is ___ Ω.
stays the same
The voltage drop in a parallel circuit ___ across each load.
True
Total current in a parallel circuit is calculated by adding the current in all the branches.
True
Voltage drop is proportional to the resistance value of the resistors in a series circuit.
False
Whenever the load resistance is matched to the source, less than maximum power is delivered to the load.
open
Zero current flow in a circuit indicates that there is a(n) ____________________ between the power source and a load or switch in the circuit.
power source
Zero current flow may indicate an open between the ___ and a load or switch in the circuit.
voltage divider
A ___ is a circuit that is constructed by connecting resistors in series to produce a desired voltage drop across the resistors.
True
A complex circuit includes two or more resistive loads.
electrons
A ground is an unlimited source and acceptor of ___ in a circuit.
True
A listed power rating is given in watts (W) for most appliances or in horsepower (HP) for motors.
horsepower
A power rating is listed in watts for appliances and in ____________________ for motors.
False
A series circuit has two current paths.
parallel
A(n) ____________________ circuit has two or more loads and more than one path for electron flow.
ground
A(n) ____________________ is a low-resistance conducting connection between electrical and electronic circuits, equipment, and the earth.
short circuit
A(n) ____________________ is any circuit in which current takes a shortcut around the normal path of current flow.
ballast
A(n) ____________________ resistor may be added to a parallel circuit to produce a constant flow of current.
False
As loads are added in parallel, the total current decreases.
True
As the resistance of a load decreases, the amount of power produced increases.
True
Assuming that power at each load in a series circuit is known, total power can be calculated by adding the power at each load.
True
If one component in a parallel circuit has a short circuit, the total resistance of the circuit is reduced to 0 Ω.
485
If six loads are connected in parallel and the loads produce 60 W, 75 W, 100 W, 150 W, 60 W, and 40 W, the total circuit power is ___ W.
0.37
If the current in each branch in a parallel circuit is 0.3 A and 0.07 A, the total current is ___ A.
33.95
If the current through four loads connected in parallel in a circuit is 0.221 A, 16.73 A, 3.3 A, and 13.7 A, the total current is ___ A.
20.67
If the current through four loads connected in parallel in a circuit is 0.522 A, 10.25 A, 7 A, and 2.9 A, the total current is ___ A.
24
If the voltage drop across two loads connected in parallel is 24 V, the total applied voltage in the circuit is ___ V.
3
If the voltage drop across two loads connected in parallel is 3 V, the total applied voltage in the circuit is ___ V.
True
In a DC parallel circuit, electrons flow in one direction.
VT
In a complex circuit, the source voltage is designated as ___.
branch
In a parallel circuit, each load is called a(n) ___ circuit.
False
In a parallel circuit, the voltage drop across each load can be different.
False
In a series circuit, the sum of the voltage increases is equal to the source voltage.
False
In a series circuit, there are three paths for electron flow.
0
The current through a short circuit can be any value because the resistance of the short circuit is always equal to ____________________ Ω.
True
The lower a load's resistance, the more power produced in a series circuit.
201.76
The minimum allowable voltage at the load of a 208 V circuit with a load resistance of 25 Ω and load current of 8 A is ___ V.
36
The supply voltage in a series circuit containing a total resistance of 3 Ω and total current of 12 A is ___ V.
75
The supply voltage in a series circuit containing a total resistance of 5 Ω and total current of 15 A is ___ V.
0.0077
The total current flow and the current flow through each branch of a circuit that has a total voltage of 15 V connected in parallel with a 3.5 kΩ resistor and a 4.4 kΩ resistor is ___ A.
2.2
The total resistance in a parallel circuit that has a total current of 5.5 mA and a total voltage of 12 V is ___ kΩ.
24
The voltage drop across a 2 Ω resistor in a circuit that has a total current of 12 A is ___ V.
16D.64
The voltage drop across an 8 Ω resistor in a circuit that has a total current of 8 A is ___ V.
28.8
The voltage in a parallel circuit branch that has a resistor of 3.6 kΩ and a current of 8 mA flowing through it is ___ V.
33
The voltage in a parallel circuit branch that has a resistor of 5.5 Ω and a current of 6 A flowing through it is ___ V.
added
To find total resistance in a series circuit, the values of the resistors in the circuit are ___.
False
Total current decreases if parallel loads are added and increases if parallel loads are removed.
sum
Total power of a parallel circuit is equal to the ____________________ of the power produced by each load.
power
Total voltage multiplied by total circuit current yields total ____________________ in a circuit.
False
Using parallel power distribution permits various loads to be connected to different power sources.
drop
Voltage ___ is the amount of voltage used by a device when current passes through it.
False
When a DMM set to measure current is inserted in series at every junction of the components in a series circuit, it reads a different current value at each junction.
True
When current takes a shortcut around the normal path of current flow, it is referred to as a short circuit.
reciprocal
When only two resistors are in parallel, the ___ method reduces to the product over the sum of the resistor values.
Current
When selecting a heating element for an application, the size of the heating element is typically stated in ____________________ and is based on the application.
Current
___ is the flow of electrons through an electrical circuit.
Heat
____________________ is produced any time electrons flow through a wire that has resistance.
Voltage drop
____________________ is the amount of voltage consumed by a component as current passes through it.
Resistance
____________________ is the opposition to electron flow.
Power
____________________ produced is measured in watts (W).
