University Physical Science
When a 10 V battery is connected to a resistor, 2 A of current flow in the resistor. What is the resistor's value?
5 ohms
Which of these particles has an electrical charge?
All of the above (proton, electron, and ion)
The primary purpose of a lightning rod is to
discharge the structure to which it is attached
Two charges separated by 1 m exerted a 1 N on each other. If the charges are pulled to a 3 m separation distance, the force on each charge will be
.11 N
An electron is pushed into an electric field where it acquires a 1 V electrical potential. If two electrons are pushed the same distance into the same electric field, the electrical potential of the two electrons is
1 V
If you use 10 J of work to push a coulomb of charge into an electric field, its voltage with respect to is starting position is
10 V
How much current is in a 120 volt line at 1200 watts?
10 amperes
How much current is in a 1200 watt device operating on 20 volts?
10 amperes
A 10-ohm resistor is connected to a 120-volt power supply. The current in the resistor
12 A
The current though a 10 ohm resistor connected to a 120 V power supply is
12 A
A coulomb of charge that passes through a 12 volt battery is given
12 joules
A certain light bulb with a resistance of 95 ohms is labeled 150 W. This bulb was designated for use in a
120 V circuit
Two charges separated by 1 m exert a 1 N force on each other. if the charges are pushed to .25 m separation, the force on each charge will be
16 N
What is the power rating of a lamp connected to a 12-V source when it carries 1.5A?
18 W
When a pair of 1 ohm resistors are connected in series, their combined resistance is
2 ohms and when in parallel, 1/2 ohms
When a battery does 24 J of work on a 10 C of charge, the voltage it supplies is
2.4 V
A 4 ohm resistor is connected in parallel with a 6 ohm resistor. This combination produces an equivalent resistance of
2.4 ohms
If a neutral atom has 22 protons in its nucleus, the number of surrounding electrons is
22
The current through two identical light bulbs connected in series is 0.25 A. The voltage across both bulbs is 110 V. The resistance of a single bulb is
220 ohms
A 120 volt line carries 20 amperes. The power expended is
2400 watts
The electrical force on a 2 C charge is 60 N. What is the value of the electric field at the place where the charge is located?
30 N/C
Two charges separated by 1 m exert a 1 N force on each other. If the magnitude of each charge is doubled, the force on each charge is
4 N
A coulomb of charge that passes through a 6 V battery is given
6 joules
A 60 W light bulb and a 100 W light bulb are each rate at 120 V. Which light bulb has a larger resistance?
60 W bulb
Which statement is correct?
Charge flows in a current.
Which of these statements is true?
Electric current is a flow of electric charge
What is the rate at which electric energy is converted to another form or transferred to another device?
Electric power
Which force binds atoms together to form molecules?
Electrical
Which is the predominant carrier of charge in copper wire?
Electron
Two charged particles repel each other with a force F. If the charge of one of the particles is doubled and the distance between them is also doubled, then the force will be
F/2
Which of these rules is basic to all of physics?
The conservation of energy and the conservation of charge (all of the above)
In a common dc circuit, electrons move at speeds of
a fraction of a cm per second
The unit of electric charge, the coulomb, is the charge on
a specific large number of electrons
Superconductros are noted for their
absence of electric resistance
When you buy a water pipe in a hardware store, the water isn't included. When you buy a copper wire, electrons are
already in the wire
Charge carriers in a metal are electrons rather than protons because electrons
are loosely bound
An electron and proton
attract each other
When we say charge is conserved, we mean that charge can only
be transferred from one place to another
Charges on the plates of a charged capacitor reside on the surfaces
between the capacitor plates
To say that electric charge is conserved is to say that electric charge
can neither be created nor destroyed
An ampere is a unit of electrical
charge
The electrical force between charges is strongest when the charges are
close together
The rate at which electrons flow in a wire is measured by
current
When you double the voltage in a simple electric current, you double the
current
When you increase the potential energy of a charged particle, you increase its ability to
do work
A balloon will stick to a wooden wall if the balloon is charged
either positively or negatively
Electric potential, measured in volts, is the ratio of electric energy to amount of
electric charge
Every proton in the universe is surrounded by its own
electric field and gravitational field
The fundamental force underlying all chemical reactions is
electrical
Two protons attract each other gravitationally and repel each other electrically. By far, the greater is the
electrical repulsion
When we say an appliance "uses up" electricity, we really are saying that
electron kinetic energy is changed into heat
In an electrically neutral atom, the number of protons in the nucleus is equal to the number of
electrons that surround the nucleus
Electric potential, measured in volts, is a ratio of
energy to charge
The strength of an electric field is measured by the force
exerted on a charged particle in the field
According to Coulomb's law, a pair of particles that are placed twice as close to each other will experience forces that are
four times as strong
According to Coulomb's law, doubling both charges of a pair of particles will result in a force between them that is
four times as strong
Alternating current is normally produced by a
generator
Electric potential energy is measured in joules. Electric potential, on the other hand (electric potential energy per charge) is measured
in volts
As more lamps are put into a parallel circuit, the overall current in the power source
increases
Heat a copper wire and its electric resistance
increases
To say that electric charge is quantized is to say that the charge on an object
is a whole-number multiple of the charge of one electron
To say that an object is electrically polarized is to say
it charges have been rearranged
When two identical lamps in a circuit are connected in a parallel, the total resistance is
less than the resistance of either lamp
When two identical lamps in a circuit are connected in parallel, the total resistance is
less than the resistance of either lamp
Which is more dangerous, touching a faulty 110 V light fixture or a Van de Graaff generator charged to 100,000 V?
light fixture
The electrical force between charges depends on the
magnitude of electric charges and the separation distance between electric charges
When two lamps are connected in a series to a battery, the electrical resistance that the battery senses is
more resistance of either lamp
A 10 ohm resistor carries 10 amperes. The voltage across the resistor is
more than 10 V
If you comb your hair and the comb becomes positively charged, then your hair becomes
negatively charged
Rub electrons from your hair with a comb and the comb becomes
negatively charged
The electric field inside the dome of a Van de Graaff generator
neither of these
To say that electric charge is conserved means that no case has ever been found where
net charge has been created or destroyed
The electric field around an isolated electron has a certain strength 1 cm from the electron. The electric field strength 2 cm from the electron is
none of the above
A conductor differs from an insulator in that a conductor
none of these
The current in a 100 W bulb connected to a 120 V source is
none of these
The net charge on a charge capacitor
none of these-the net charge is zero
A wire carrying a current is normally charged
not at all
An uncharged pith ball is suspended by a nylon fiber. When a negatively charged rubber rod is brought nearby, without touching it, the pith ball becomes
poliarized
When you brush your hair and scrape electrons from your hair, the charge of your hair is
positive
Strip electrons from an atom and the atom becomes a
positive ion
A negatively charged rod is brought near a metal can that rests on a wood table. You touch the opposite side of the can momentarily with your finger. The can is then
positively charged
A balloon will stick to a wooden wall if the balloon is charged either
positively or negatively
When you do work on an electrically charged particle, you change the particle's
potential energy
The purpose of a safety fuse is to
prevent overloading in a circuit
The direction of an electric field is the direction of the force that it would exert on a
proton
The direction of an electric field, by convention, is the direction of force that the field would exert on a
proton
A positive ion has more
protons than electrons
When the distance between two charges is halved, the electrical force between the charge
quadruples
When the distance between two charges is halved, the electrical force between the charges
quadruples
A main difference between gravitational and electric forces is that electoral forces
repel or attract
The main difference between gravitational and electric forces is that electrical forces
repel or attract
When a negatively charged balloon is placed against a non-conducting wall, negative charges in the wall are
repelled from the balloon
A difference between electric forces and gravitational forces is that electoral forces include
repulsive interactions
A transistor is an example of a
semiconductor
Particle A and Particle B interact with each other. Particle A has twice the charge of Particle B. Compared to the force on Particle A, the force on Particle B is
the same
Two lamps, one with a thick filament and one with a thin filament, are connected in a parallel to a battery. The current is largest in the lamp with the
thick filament
A major difference between DC and AC in circuits is the
way charges flow
When a car is struck by lightening, the resulting electric field inside the car is
zero