In the unlikely case of a lightening strike, it is worse to be inside a building framed with
wood
although the energy per coulomb of a high-voltage party balloon is high, the energy transfer that occurs if you touch it is low due to
the relatively small amount of charge
if 16 J of energy are stored by pushing 4 coulombs of charge into an electric field, the charges voltage with respect to its starting position is
4 V
The primary purpose of a lightening rod is to
discharge the structure to which it is attached
a 0.5-c charge is placed in a location where the electric field is 5 N/C. How much electric force is exerted on the charge
2.5 N
The electric power of a lamp that carries 2 A at 120 V is
240 watts
although electrons in metal move in haphazard directions at many times the speed of sound, the drift speed of electrons that compose electric current is
a fraction of a centimeter per second
connect a pair of lamps in series and current is drawn from the battery. connect the same lamps in parallel and the current drawn is
more
the headlights, radio, and defroster dan in an automobile are connected in
parallel with a switch for each
for electric current in the home, your power company supplies
energy
Which pole of a compass needle points a South Pole of magnet?
North Pole
the force on an electron moving in a magnetic field will be the largest when its direction is
perpendicular to the magnetic field direction
An iron rod becomes magnetic when
the domains of aligned spinning electrons are aligned with each other in the same direction
as the number of loops in a current carrying wire is increased, the
stronger the enclosed magnetic field
surrounding every moving electron is
a magnetic field and an electric field
A certain transformer doubles input voltage. If the primary coil draws 10 A of current then the current in the secondary coil is
5 A
Power is transmitted at high voltages because the corresponding current in the wires is
low so that overheating of the wires is minimized
If a magnet is pushed into a coil, voltage is induced across the coil. If the same magnetic pushed into a coil twice as fast through twice the number of loops
four times as much voltage induced
A device that transforms electrical energy to mechanical energy is a
motor
Voltage can be induced in a wire by
Moving the wire near a magnet, moving a magnet near the wire, changing the current in a nearby wire.
To say that an object is electrically polarized is to say
its charges have been rearranged
two charges that are separated by one meter exert 1-N forces on each other. If the charges are pushed together so the separation is 25 centimeters the forces on each charge will be
16 N
To say that electric charge is conserved means that no case has ever been found where the
net charge has been created or destroyed
insulating materials are composed of atoms with
tightly bound outer electrons
In an electrically neutral atom the number of protons in the nucleus is equal to the number if
electrons that surround the nucleus
a 16 V battery gives 4 Joules of energy to
.25
about how much resistance does a standard light bulb have
200 ohms
a toaster with a resistance of 20 ohms is plugged into a 120 v outlet. What is the current in the toaster
6 A
Receiving an electric shock is much more dangerous when your skin is wet because
wet skin reduces the body resistance
electrons are made to flow in a wire when there is
a voltage difference across its ends
In the unlikely case of a lightening strike, it is worse to be inside a building framed with
wood
although the energy per coulomb of a high-voltage party balloon is high, the energy transfer that occurs if you touch it is low due to
the relatively small amount of charge
if 16 J of energy are stored by pushing 4 coulombs of charge into an electric field, the charges voltage with respect to its starting position is
4 V
The primary purpose of a lightening rod is to
discharge the structure to which it is attached
a 0.5-c charge is placed in a location where the electric field is 5 N/C. How much electric force is exerted on the charge
2.5 N
The electric power of a lamp that carries 2 A at 120 V is
240 watts
although electrons in metal move in haphazard directions at many times the speed of sound, the drift speed of electrons that compose electric current is
a fraction of a centimeter per second
connect a pair of lamps in series and current is drawn from the battery. connect the same lamps in parallel and the current drawn is
more
the headlights, radio, and defroster dan in an automobile are connected in
parallel with a switch for each
for electric current in the home, your power company supplies
energy
Which pole of a compass needle points a South Pole of magnet?
North Pole
the force on an electron moving in a magnetic field will be the largest when its direction is
perpendicular to the magnetic field direction
An iron rod becomes magnetic when
the domains of aligned spinning electrons are aligned with each other in the same direction
as the number of loops in a current carrying wire is increased, the
stronger the enclosed magnetic field
surrounding every moving electron is
a magnetic field and an electric field
A certain transformer doubles input voltage. If the primary coil draws 10 A of current then the current in the secondary coil is
5 A
Power is transmitted at high voltages because the corresponding current in the wires is
low so that overheating of the wires is minimized
If a magnet is pushed into a coil, voltage is induced across the coil. If the same magnetic pushed into a coil twice as fast through twice the number of loops
four times as much voltage induced
A device that transforms electrical energy to mechanical energy is a
motor
Voltage can be induced in a wire by
Moving the wire near a magnet, moving a magnet near the wire, changing the current in a nearby wire.
To say that an object is electrically polarized is to say
its charges have been rearranged
two charges that are separated by one meter exert 1-N forces on each other. If the charges are pushed together so the separation is 25 centimeters the forces on each charge will be
16 N
To say that electric charge is conserved means that no case has ever been found where the
net charge has been created or destroyed
insulating materials are composed of atoms with
tightly bound outer electrons
In an electrically neutral atom the number of protons in the nucleus is equal to the number if
electrons that surround the nucleus
a 16 V battery gives 4 Joules of energy to
.25
about how much resistance does a standard light bulb have
200 ohms
a toaster with a resistance of 20 ohms is plugged into a 120 v outlet. What is the current in the toaster
6 A
Receiving an electric shock is much more dangerous when your skin is wet because
wet skin reduces the body resistance
electrons are made to flow in a wire when there is
a voltage difference across its ends