AC/DC Finals Part 1 CH 6-10
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.
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.
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
An open circuit is the same as a series circuit in that any open point in the circuit causes electron flow to stop.
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
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.
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.
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.
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.
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.
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.
stays the same
The voltage drop in a parallel circuit ___ across each load.
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.
True
Total current in a parallel circuit is calculated by adding the current in all the branches.
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.
True
Voltage drop is proportional to the resistance value of the resistors in a series circuit.
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.
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.
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).
