1
Created by Boundless
Devices that can provide the electromotive force include
A
All of these answers
B
electrical and Van de Graaff generators
C
electrochemical cells, thermoelectric devices, and solar
cells
D
transformers
2
Created by Boundless
Electromotive force is considered
A
a force measured in Newtons
B
an energy measured in Joules
C
a charge measured in Coulombs
D
a potential measured in Volts
3
Created by Boundless
An electrical circuit is an interconnection of
A
machine elements that has a closed loop
B
machine elements that has an open loop
C
electrical elements that has a closed loop
D
4
electrical elements that has an open loop
Created by Boundless
A direct current circuit is an electrical circuit that consists of
A
AC power supplies and resistors
B
constant voltage sources, constant current sources, and
capacitors
C
constant voltage sources, constant current sources, and
resistors
D
capacitors, transformers, and resistors
5
Created by Boundless
Direct current is produced by sources such as
A
All of these answers
B
thermocouples
C
batteries
D
solar cells
6
Created by Boundless
The total resistance in the circuit with resistors connected in parallel is equal to the
A
resistance of the smallest resistor
B
sum of the individual resistances
C
sum of the inverse of each individual resistances
D
resistance of the largest resistor
7
Created by Boundless
The total resistance in the circuit with resistors connected in series is equal to the
A
sum of the inverse of each individual resistances
B
resistance of the smallest resistor
C
sum of the individual resistances
D
resistance of the largest resistor
8
Created by Boundless
A combination circuit contains resistors connected
A
either in series or in parallel
B
only in series
C
both in series and in parallel
D
only in parallel
9
Created by Boundless
One practical implication of a combination circuit is that
A
the current through all of the resistors is the same
B
resistance in wires reduces the current and power delivered
to a resistor
C
its resistance is extremely high
D
all resistors are subject to the same voltage
10
Created by Boundless
When voltage sources are connected in series,
A
both electromotive forces and resistances are additive
B
both electromotive forces and resistances are the same
C
electromotive forces are additive while resistances are the
same
D
electromotive forces are the same while resistances are
additive
11
Created by Boundless
When voltage sources are connected in parallel,
12
A
both electromotive forces and resistances are the same
B
both electromotive forces and resistances are additive
C
electromotive forces are additive while resistances are the
same
D
electromotive forces are the same while resistances are
additive
Created by Boundless
When the voltage sources are connected in the same polarity in series, they
A
are additive and result in a higher total electromotive force
B
can be used to charge the lower voltage source
C
are subtractive and result in a lower total electromotive
force
D
produce a higher current
13
Created by Boundless
The output, or terminal voltage of a voltage source such as a battery, depends
A
both on the electromotive force and external resistance
B
only on the external resistance
C
both on the electromotive force and internal resistance
D
only on the electromotive force
14
Created by Boundless
Terminal voltage (V) is calculated from the electromotive force (emf) using:
A
emf
, where r is the internal resistance and I is the
Ir
current flowing at the time of the measurement
V =
B
V = emf + I r , where r is the internal resistance and I is
the current flowing at the time of the measurement
C
V = emf − I r , where r is the internal resistance and I is
the current flowing at the time of the measurement
D
15
−
emf
, where r is the internal resistance and I is the
current flowing at the time of the measurement
V =
Ir
Created by Boundless
Kirchhoff's rules can be used to analyze
A
any circuit
B
only circuit that contains resistors connected in series
C
only circuit that contains resistors connected in parallel
D
only circuit that contains a resistor and a capacitor
16
Created by Boundless
Kirchhoff's rules are only useful for characterizing those circuits that
A
can be simplified by combining elements in series and
parallel
B
contain resistors connected in series
C
cannot be simplified by combining elements in series and
parallel
D
contain resistors connected in parallel
17
Created by Boundless
Kirchhoff's loop rule states that the sum of the
A
emf values in any closed loop is equal to the difference of
the potential drops in that loop
B
sum of the emf values in any closed loop is equal to the
sum of the potential drops in that loop
C
currents flowing into and out of that junction are different
D
currents flowing into and out of that junction are equal
18
Created by Boundless
Kirchhoff's junction rule states that the sum of the
A
sum of the currents flowing into and out of that junction are
equal
B
emf values in any closed loop is equal to the difference of
the potential drops in that loop
C
currents flowing into and out of that junction are different
D
emf values in any closed loop is equal to the sum of the
potential drops in that loop
19
Created by Boundless
Kirchhoff's loop rule holds under the assumption that
20
A
there is a fluctuating magnetic field linking the closed loop
B
there is no fluctuating magnetic field linking the closed loop
C
the circuit is connected to the DC source
D
the circuit is connected to the AC source
Created by Boundless
Kirchhoff's junction rule holds for all cases in which
A
total electric charge is not constant in the region in
consideration
B
there is a flow of charge across the boundary of the region
C
total electric charge is constant in the region in
consideration
D
there is a current flowing through the region
21
Created by Boundless
Kirchhoff's circuit laws are two equations that
A
demonstrate that only energy is conserved in electrical
circuits
B
demonstrate that only charge is conserved in electrical
circuits
C
violate the conservation of energy and charge in the
context of electrical circuits
D
address the conservation of energy and charge in the
context of electrical circuits
22
Created by Boundless
A voltmeter is an instrument that
A
measures the electric current in a circuit
B
measures the difference in electrical potential between two
points in an electric circuit
C
converts the energy of light directly into electricity
D
transfers energy by inductive coupling between winding
circuits
23
Created by Boundless
An ammeter is an instrument that
A
measures the difference in electrical potential between two
points in an electric circuit
B
converts the energy of light directly into electricity
C
measures the electric current in a circuit
D
transfers energy by inductive coupling between winding
circuits
24
Created by Boundless
The following correctly describes circuit connection of an ammeter and a
voltmeter:
A
Both a voltmeter and an ammeter are connected in series
B
Both a voltmeter and an ammeter are connected in parallel
C
A voltmeter is connected in parallel while an ammeter is
connected in series
D
A voltmeter is connected in series while an ammeter is
connected in parallel
25
Created by Boundless
Null measurements are employed to reduce the uncertainty in the measured A
strength of magnetic field
B
voltage and current
C
electric charge
D
26
temperature
Created by Boundless
Measurements of voltages and current with standard voltmeters and ammeters
A
alter the circuit because ammeters draw some extra current
while voltmeters reduce current flow
B
do not alter the circuit
C
alter the circuit because voltmeters and ammeters can be
incorrectly connected
D
alter the circuit because voltmeters draw some extra
current while ammeters reduce current flow
27
Created by Boundless
Null measurements can be performed using
A
an ammeter and and a voltmeter
B
am
C
the potentiometer and the Wheatstone bridge
D
a multimeter
28
Created by Boundless
An RC circuit is one containing
A
two capacitors
B
a resistor and capacitor
C
two resistors connected in series
D
two resistors connected in parallel
29
Created by Boundless
When an RC circuit is connected to a DC voltage source, the capacitor is charged
A
logarithmically in time
B
sublinearly in time
C
exponentially in time
D
linearly in time
30
Created by Boundless
Impedance is the measure of
31
A
a current passing through a circuit when a voltage is
applied
B
the opposition that a circuit presents to the passage of a
current when no voltage is applied
C
a current passing through a circuit when no voltage is
applied
D
the opposition that a circuit presents to the passage of a
current when a voltage is applied
Created by Boundless
For a series RC circuit, the impedance (Z) is related with the resistance (R) and
capacitance (C) as:
A
, where w is the angular frequency
B
, where w is the angular frequency
C
, where w is the angular frequency
D
, where w is the angular frequency
32
Created by Boundless
In a series RC circuit connected to an AC voltage source, the currents in the
resistor and capacitor are
A
different and out of phase
B
equal and in phase
C
equal and out of phase
D
different and in phase
33
Created by Boundless
In a series RC circuit connected to an AC voltage source, the total voltage is equal
to
A
the voltage on the capacitor
B
the inverse sum of voltages on the resistor and capacitor
C
the sum of voltages on the resistor and capacitor
D
34
the voltage on the resistor
Created by Boundless
The power factor is defined as a
A
cosine of phase difference and can range from 0 to 1
B
sine of phase difference and can range from -1 to 1
C
sine of phase difference and can range from 0 to 1
D
cosine of phase difference and can range from -1 to 1