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WorksheetsElectric Circuits Quiz
Total questions: 100
Worksheet time: 1hrs 23mins
Match each unit of measurement to its physical quantity on the left.
joule
ampere
watt
volt
coulomb
Match each description to the items below.
parallel
resistors
current
series
ammeter
The conservation of charge in a circuit implies that _____.
electrons cannot be created or destroyed
the total amount of charge is constant
electrons can move through the circuit
all of the above
A conventional current is the flow of _____.
electrons
alternating current
positive charge
electrons or ions
The potential difference between two points in space is 1000 V, and 2 coulombs of charge is transferred from the point of lower potential to the point of higher potential. The amount of work done is ______.
500 J
2000 J
2×10^-3 J
1000 J
A 9-V battery is connected to a toy car, and the current produced is 2 A. The rate at which energy is delivered to the toy car is ______.
4.5 W
4.5 J
18 J
18 W
A 60-W lightbulb runs for 2 hours. The energy transformed is ______.
120,000 J
432,000 J
120 J
30 J
A heater that operates at 220 W is connected to a 110-V outlet. The current through the heater is ______.
2.2 A
2 A
0.5 A
20 A
A lamp is connected to a battery of 50 V, and the current through the circuit is 2 A. The resistance of the lamp is ______.
100 Ω
150 Ω
0.04 Ω
25 Ω
The current through a resistor of 15 Ω is 5.0 A. The potential difference across the resistor is ______.
45 V
0.33 V
75 V
3.0 V
A series circuit has a power source of 120 V and a 150-Ω resistor. The power delivered by the power source is ______.
96 W
96 kW
192 W
9.6 kW
The rating of a lightbulb is 100 W and its resistance is 50 Ω. The current through the lightbulb when it is on is ______.
2 A
1.4 A
5000 A
0.5 A
The amount of energy transformed by a 150-W lightbulb in 24 h is ______.
3.6 kWh
130,000 J
3.6 J
3×10^3 kWh
A household’s electric bill is $56 for the month of February and the cost of electricity is $0.12 per kilowatt-hour. The household used ______ of energy in this month.
467 kJ
6.7 kW
467 kWh
67 kJ
A conducting wire has a resistance of 0.02 Ω/m. The power of this 100-m wire when it carries a current of 20 A is ______.
8 W
800 W
800 J
0.8 J/s
If four electric devices are connected in a series circuit, the number of current paths is equal to ____.
four
three
one
two
A series circuit contains four resistors. Each resistor has a different resistance. What is the equivalent resistance of the circuit?
R/4
4R
R₁ + R₂ + R₃ + R₄
(R₁ + R₂ + R₃ + R₄)/4
In an electric circuit, ____ are switches that act as safety devices.
combined circuits
fuses and voltage dividers
ammeters
fuses and circuit breakers
If three resistors are connected in parallel, there are ____ current paths in the circuit.
four
one
three
two
A series circuit has a 120-V generator, but requires a source that provides a potential difference of only 60 V. To achieve the desired potential difference, a ____ can be used.
semiconductor
sensor
voltage divider
photoresistor
A closed circuit connects a 36-V battery, a potentiometer, an ammeter, a bulb, and voltmeter. The voltmeter is connected in parallel across the potentiometer, and the other components are connected in series. Suppose that the initial setting of the potentiometer is 1 Ω. Fill in the missing values in the table below for the current in the lamp as the resistance in the potentiometer increases from 1 Ω to 100 Ω, 200 Ω, and finally, 300 Ω.
Suppose an ammeter reads 1.0 A, 0.12 A, 0.18 A, and 0.36 A. Fill in the table below showing the resistance of the potentiometer for each reading on the ammeter for a closed circuit with a 36-V battery.
(a)
A wire is connected to a 9-V battery and ammeter, and its resistance is measured. The length of the wire is varied, and the values shown in the table are obtained. Complete the table by filling in the missing values for resistance and current.
To measure the current through a resistor, an ammeter should be connected in series with the resistor.
True
False
The equivalent resistance of a parallel circuit is always less than the resistance of any resistor in the circuit.
True
False
A voltmeter should have a very low resistance so that it causes the largest possible changes in currents and potential differences in the circuit.
True
False
The resistance of an ammeter should be as low as possible.
True
False
To measure the potential difference across a resistor, connect a voltmeter in parallel with the resistor.
True
False
The increase in electric potential provided by the generator or other energy source is equal to the sum of the drops in electric (a) across the lamps in the circuit.
The current produced in a given circuit hooked up to a given potential difference depends on the (a) of that circuit.
Complete the following statements about parallel electric circuits. a. The potential difference across each path is ________________. b. The ________________ of the total resistance is the sum of the reciprocals of the individual resistances. c. In a parallel circuit, the total current is the ________________ of the currents through each path. d. ________________ enable a user to turn on some of the electric devices and not others.
the same
total resistance
sum
Switches
Current is represented by the symbol (a) .
A (a) can measure the potential difference across a lightbulb.
Current can only travel in a (a) circuit—one in which all of the switches are closed.
To measure the potential drop across a resistor, a voltmeter is connected in (a) with the resistor.
Two resistors of 3.0 Ω and 8.0 Ω are connected in series across a 9.0-V battery. What is the equivalent resistance of the circuit? ________________ Ω What is the current through the 3.0-Ω resistor? ________________ A What is the current through the 8.0-Ω resistor? ________________ A What is the potential difference across the 3.0-Ω resistor? ________________ V What is the potential difference across the 8.0-Ω resistor? ________________ V
A 15-Ω bell and an 8.0-Ω lamp are connected in parallel and placed across a potential difference of 42 V. What is the equivalent resistance of the circuit? ________________ Ω What is the current in the circuit? ________________ A What is the current through each resistor? I_bell = ________________ A I_lamp = ________________ A What is the potential difference across each resistor? V_bell = ________________ V V_lamp = ________________ V
Refer to the diagram to answer the following questions.
A (a) is a material with zero resistance.
A (a) is a device designed to have a specific resistance.
Match each vocabulary term to its definition.
a unit of energy - kilowatt-hour
the unit of current - ampere
Match each vocabulary term to its definition.
a device used to measure the current in part of a circuit
converts chemical energy to electrical energy
a device that detects small differences in current caused by an extra current path and opens the circuit
a short piece of metal that melts if a current that is too large passes through it
a device used to measure the potential difference between two points
The __ of a wire determines how much current there will be through the wire when a potential difference is applied.
ductility
resistance
malleability
voltage
Match each vocabulary term to its definition.
the occurrence when a circuit forms that has a very low resistance
a circuit in which there are several different paths for a current
a circuit in which there is only one current path
In a(n) ________________, there is only one path for the current.
In a(n) ________________, there is more than one path for the current.
The ________________ is the flow of charged particles.
A(n) ________________ is the flow of positive charge.
A(n) __ is a closed loop in which electrons can move.
electric circuit
voltmeter
magnetic circuit
ammeter
What is the value of a single resistor that could replace all resistors in a circuit without changing the current?
equivalent magnetism
equivalent current
equivalent voltage
equivalent resistance
What is a series circuit used to produce a voltage source from a higher-voltage battery called?
voltage divider
resistor circuit
ampere divider
step-down transformer
An object that is magnetic has ____.
only a south-seeking pole
an east-seeking pole and a west-seeking pole
only an east-seeking pole
a north-seeking pole and a south-seeking pole
The magnitude of the current in a wire is ____ to the magnetic field around the wire.
equal
proportional
inversely proportional
parallel
Increasing the number of loops in an electromagnet causes the strength of the magnetic field to ____.
increase
double
decrease
remain the same
The magnetic force on a current-carrying wire in a magnetic field is ____ the direction of the current.
perpendicular to
opposite
parallel to
the same as
The magnitude of the magnetic force on a current-carrying wire depends on the strength of the magnetic field, the current in the wire, and the length of wire in the magnetic field.
True
False
When two parallel wires carry currents in opposite directions, their magnetic fields attract each other.
True
False
A device used to measure very small electric currents is a voltmeter.
True
False
In an electric motor, current is reversed every complete turn.
True
False
A wire carries a current of 6.0 A. The wire is at right angles to a uniform magnetic field, and 0.80 m of the wire is in the field. The force on the wire is 0.62 N. What is the strength of the magnetic field?
(a)
A wire is at right angles to a uniform magnetic field of 0.400 T. The current through the wire is 4.00 A. What is the force that acts on the wire when 60.0 cm is in the field?
(a)
A wire carries a current of 12 A. The wire is at right angles to a uniform magnetic field that exerts a force of 0.50 N on the wire when 2.0 m of the wire is in the field. What is the strength of the magnetic field?
(a)
A wire is at right angles to a magnetic field that exerts a force of 2.4 N on the wire. There is a current of 8.6 A through the wire. The magnetic field is 0.66 T. What length of wire is in the field?
(a)
A high-speed electron travels at right angles to a magnetic field of 0.420 T. The electron is traveling at 3.46×10^7 m/s. What is the magnitude of force acting on the electron?
(a)
A section of wires and resistors in a circuit has a total resistance of 6.0 Ω and a potential difference of 120 V. If 0.40 m of the wire is placed in a uniform magnetic field at right angles to the field, the force on the wire is 0.50 N. What is the strength of the magnetic field? _______________ T
A proton travels at 1.0×10^5 m/s, perpendicular to a uniform magnetic field of 5.5×10^−5 T. What is the magnitude of the acceleration of the proton? _______________ × 10^8 m/s^2
Match each vocabulary term to its definition.
a long coil of wire that contains many loops | solenoid
a wire coil in an electric motor made of many loops mounted on a shaft or axle | armature
a magnet created when there is a current through a coil of wire | electromagnet
A group of neighboring atoms whose electrons’ magnetic fields all align in the same direction is called a(n) __.
electromagnet
armature
ion field
domain
Fill in the blanks using the available answer choices. Select the answers from the drop-down menus. 1. A(n) _______________ is a device that converts electrical energy into mechanical energy. 2. A(n) _______________ is a device used to measure very small currents.
electric motor
galvanometer
A magnet is __ , which means that it has two distinct and opposite ends.
polarized
elasticized
magnetized
synthesized
__ exists in a region of space where a magnetic force occurs.
Electric flux
An electric field
Magnetic flux
A magnetic field
The number of magnetic field lines that pass through a surface is called magnetic __.
Fill in the blanks using the available answer choices. When a wire is moved __ to a magnetic field, a current is created.
parallel
perpendicular
An electric generator converts thermal energy to electrical energy.
True
False
Back-EMF is in the direction that opposes the current in a current-carrying wire.
True
False
An eddy current is generated when a piece of metal moves perpendicular to a magnetic field.
True
False
Transformers can be used to increase AC voltages.
True
False
The secondary coil of a step-down transformer has a higher potential difference across it than the primary coil.
True
False
In a step-down transformer, the current is less in the secondary circuit than in the primary circuit.
True
False
In the long-distance transmission of electrical energy, there are step-up transformers that develop voltages as high as 480,000 V.
True
False
The induction of EMF in a wire carrying a changing current is an example of ______.
mutual inductance
a step-up transformer
an eddy current
self-inductance
Another term for RMS (root mean square) voltage is ______.
The current is greatest in a closed loop of conductor when the loop’s motion is ______ the magnetic field.
slow and perpendicular to
slow and parallel to
fast and parallel to
fast and perpendicular to
The heavy current required when a motor starts can cause _____ in the wires that carry current to the motor.
mutual inductance
a drop in electric potential
surge in electric potential
an eddy current
The potential differences across alternating-current circuits may be increased or decreased by _____.
transformers
induced EMF
primary coils
secondary coils
A 25.5-m wire moves perpendicular to a magnetic field of 4.42×10⁻⁴ T at a speed of 14.4 m/s. An EMF of (a) V is induced in the wire.
An AC generator develops a maximum EMF of 5.00×10² V. The effective EMF delivered to an external circuit is (a) V.
A step-up transformer has 350 turns on the primary coil and 1500 turns on the secondary coil. The primary coil has a potential difference of 110.0 V across it. The potential difference across the secondary circuit is _________________ V. The current in the secondary circuit is 15.0 A. Therefore, the current in the primary circuit is _________________ A. The power input of the transformer is _________________ W. The power output of the transformer is _________________ W.
(a)
The primary coil of a transformer has 725 loops and is connected to a 120.0-V source. (a) loops would be needed in the secondary coil to supply 555 V.
A wire is connected across a circuit with 5.50 Ω of resistance. If 1.12 m of the wire is moving perpendicularly through a magnetic field of 0.250 T and the resulting current through the wire is 1.34×10⁻² A, the speed of the wire is (a) m/s.
An AC generator requires 225 J of mechanical energy per second to produce 175 W of effective power. The efficiency of the generator is _________________ %. If the total resistance in the wire in the generator is 15.0 Ω, then the maximum current produced is _________________ A.
(a)
If the average power dissipated by an electric light is 150 W, the maximum power is (a) W.
A 220-W transformer has an input voltage of 35 V and an output voltage of 12 V. The ratio of turns in the primary coil to turns in the secondary coil is (a) .
Thomson calculated the mass of the electron using a cathode-ray tube and a proton beam.
True
False
In Thomson’s cathode-ray tube, the cathode was negatively charged.
True
False
A mass spectrometer can be used to separate different isotopes of an element.
True
False
Ions in a mass spectrometer follow a circular path as they pass through a magnetic field.
True
False
Induction is a process in which a moving ____ produces a(n) ____.
magnetic field, electric field
magnet, electric charge
charge, current
wave, electric field
As the wavelength of an electromagnetic wave ____, the frequency of the wave ____.
increases, decreases
decreases, stays the same
decreases, decreases
increases, increases
The speed of an electromagnetic wave in any material is determined by the ____ of that material.
dielectric constant
density
thickness
electrical resistance
