WorksheetsElectricity
Total questions: 40
Worksheet time: 44mins
Aluminum sphere A contains a small negative charge and is touched by aluminum sphere B, which has a larger negative charge. Which of the following occurs next?
Protons flow from sphere B to sphere A.
Protons flow from sphere A to sphere B.
Electrons flow from sphere B to sphere A.
Electrons flow from sphere A to sphere B.
Which of the following describes an object that must have a net negative charge?
It contains more molecules than atoms.
It contains more electrons than protons.
It is carrying an electric current.
It is made of metal.
If the distance separating an electron and a proton is halved, the magnitude of the electrostatic force between these charged particles will be
unchanged
doubled
quartered
quadrupled
Two similar metal spheres, A and B, have charges of +2.0 x 10–6 coulomb and +1.0 x 10–6 coulomb, respectively, as shown in the diagram. The magnitude of the electrostatic force on A due to B is 2.4 newtons. What is the magnitude of the electrostatic force on B due to A?
1.2 N
2.4 N
4.8 N
9.6 N
Metal sphere A has a charge of –2 units and an identical metal sphere, B, has a charge of –4 units. If the spheres are brought into contact with each other and then separated, the charge on sphere B will be
0 units
–2 units
–3 units
+4 units
Gravitational forces differ from electrostatic forces in that gravitational forces are
attractive, only
repulsive, only
neither attractive nor repulsive
both attractive and repulsive
Two small metallic spheres, A and B, are separated by a distance of 4.0 X 10–1 meter, as shown. The charge on each sphere is 1.0 x 10–6 coulomb. Point P is located near the spheres. What is the magnitude of the electrostatic force between the two charged spheres?
2.2 x 10–2 N
5.6 x 10–2 N
2.2 x 104 N
5.6 x 104 N
The current through a 10.-ohm resistor is 1.2 amperes. What is the potential difference (voltage) across the resistor?
8.3 V
12 V
14 V
120 V
A 6.0-ohm lamp requires 0.25 ampere of current to operate. In which circuit below would the lamp operate correctly when switch S is closed?
In the circuit diagram below, two 4.0-ohm resistors are connected to a 16-volt battery as shown. The total current in the circuit is
4 A
2 A
0.5 A
0.25 A
A balloon is rubbed against a student’s hair and is then touched to a wall. The balloon “sticks” to the wall due to
magnetic forces between the particles of the wall
magnetic forces between the particles of the balloon and the particles of the wall
electrostatic forces between the particles of the wall
electrostatic forces between the particles of the balloon and the particles of the wall
A student combs her hair with a hard rubber
comb and then hangs the comb on a loop of
light thread that is suspended from a hook
as shown below. She immediately combs her hair with
a second identical comb and hangs it
on the second suspended loop of light
thread. If the combing has caused a
charge to accumulate on the combs, which
of the following shows what will occur?
An electric circuit is shown below. The accompanying table shows the current measured at different
levels of resistance. Based on the data shown in the table, what is the voltage drop across the variable resistor?
1.5 V
6 V
9 V
12 V
Why does a plastic rod have a negative
charge after being rubbed with a piece
of fur?
The fur gives up protons to the rod.
The rod gives up electrons to the air.
The fur gains protons from the rod.
The rod gains electrons from the fur.
Mr. Jenkins constructed a circuit consisting of a variable source, wires, and a resistor. In order to triple the
amount of current, how should he change the voltage of the source?
make the voltage three times larger
make the voltage one-third as great
make the voltage nine times larger
make the voltage one-ninth as great
What is the voltage in a circuit with a current of 3 A and a total resistance of 12 ohms?
0.25 V
4 V
15 V
36 V
The circuit diagram below shows three resistors, an ammeter, and a battery. How much current flows through the ammeter?
1.0 A
6.0 A
13.0 A
24.0 A
Which of the following statements describes the electric force between two oppositely charged particles as they
approach each other?
The attractive electric force increases.
The electric force becomes repulsive.
The magnitude of the electric force decreases.
The repulsive electric force becomes attractive.
A circuit diagram is shown above. What is the current through the 2 Ω resistor?
1.25 A
1.5 A
5.0 A
6.67 A
The diagram above shows a simple circuit. Which component is the source of energy in this circuit?
The measurements in the table above are from four circuits that each have the same components except for the battery. Which of the following statements describes how voltage, current, and resistance are related by Ohm’s law
in these circuits?
As voltage increases, current decreases and resistance decreases.
As voltage increases, current increases and resistance stays
the same.
As voltage increases, current decreases and resistance stays
the same.
As voltage increases, current stays the same and resistance decreases.
The diagram above shows a simple circuit. What is the current in the circuit?
0.83 A
1.2 A
2.0 A
22 A
The circuit shown above has a variable resistor connected to a 6.0 V battery. What amount of current flows through the battery when the variable resistor is set for 4 ohms?
1.5 A
1.0 A
0.75 A
0.50 A
Two particles with the same positive charge are 100 cm apart. What happens to the electric force between the two
particles when the charge on each particle doubles?
The electric force becomes attractive.
The magnitude of the electric force decreases.
The attractive electric force becomes two times as strong.
The repulsive electric force becomes four times as strong.
A student creates a circuit with a variable voltage supply and a 2 ohm resistor. The student varies the voltage and measures the current. The graph shows the student’s results. What was the greatest power supplied by the battery?
2 W
4 W
8 W
16 W
Which of the following is a function of a resistor in a circuit?
to disconnect the wires
to decrease the temperature
to limit the amount of current
to increase the amount of voltage
What is the primary difference between insulators and conductors?
Electrons are present in insulators but not in conductors.
Electrons are present in conductors but not in insulators.
Electrons are free to move in insulators but not in conductors.
Electrons are free to move in conductors but not in insulators.
Which of the following circuits has the greatest current?
A student builds a simple circuit and places a magnet under one of the circuit’s wires. When the switch is closed, charges flow in the circuit and the wire moves, as shown in the
diagram below. Which question is the student most
likely trying to answer?
Does a positive charge build up in the wire?
Does a negative charge build up in the wire?
Does the current in the wire create a magnetic field?
Does the current in the wire cause the wire to heat up?
Which of the following pairs of charges has the greatest attractive force?
A load uses a current of 5.0 A when it is attached to a 20 V source. What is the resistance of the load?
0.25 ohms
1.25 ohms
4.0 ohms
15.0 ohms
Which of the following describes how a generator operates?
It creates a large resistance to oppose the flow of electricity.
It rotates a coil of wire through a magnetic field to produce a current.
It uses side-by-side coils of wire to transform a voltage to a safe level.
It transmits a signal to a circuit breaker to protect its components.
A series circuit is constructed with a battery, a light bulb, and a resistor. What happens if the resistor is removed from the circuit?
The current increases and the bulb’s light becomes dimmer.
The current increases and the bulb’s light becomes brighter.
The current decreases and the bulb’s light becomes dimmer.
The current decreases and the bulb’s light becomes brighter.
A circuit has three different resistors and a battery. One of the resistors has a resistance of 10 ohm. A student wants to calculate the current flowing through this resistor. Which of the following would provide the student with enough information to calculate the current in the 10 ohm resistor?
the arrangement of the circuit
the power rating of the battery
the voltage across this resistor
the values of the other two resistors
The diagram shows a negatively charged particle traveling toward two parallel charged plates. What will most likely happen to the negatively charged particle when it travels between the charged plates?
It will accelerate as it travels in a straight line.
Its path will bend upward toward the negatively charged plate.
It will maintain its original speed as it travels in a straight line.
Its path will bend downward toward the positively charged plate.
Which statement describes what most likely occurs when a magnetic compass is placed next to a simple circuit made
from a battery, a light bulb, and a wire?
A magnetic field created by the compass causes the light bulb to
stop working.
A magnetic field created by the electric current causes the compass
needle to move.
A magnetic field created by the compass increases the current in the electrical circuit.
A magnetic field created by the electric current places negative
charges on the compass.
When an uncharged balloon is rubbed against dry uncharged hair, electrons move from the hair onto the balloon’s surface. Which table lists the charges of
the balloon and the hair after they are moved apart?
The diagram shows a parallel circuit with a 4 ohm resistor and a 12 ohm resistor. The voltage between points X
and Y is 16 V. What is the voltage across the 12 ohm resistor?
12 V
16 V
36 V
64 V
The graph below shows the relationship of voltage versus current for a circuit. This graph represents the relationship
described by which of the following laws?
Coulomb’s law
Doppler’s law
Newton’s law
Ohm’s law
Which of the following is a purpose of a battery in a circuit?
to provide voltage
to provide resistance
to turn the circuit on and off
to protect the circuit from too much current
