Physics Semester 2 Review
Terms in this set (52)
what is the unit of measure for current?
what is meant in the phrase "short circuit"?
when you bypass the normal route of the current flow
Is electric resistance greater in a short fat wire or long thin wire?
long thin wire
what term is used to describe electrical pathways?
the flow of electricity is based on...
potential difference between positive and negative areas
electricity that flows in only one direction?
what is the name of the law that is reflective in V=IR?
what type of material will have resistance close to zero at very cold temperatures?
what is the unit of power for electricity?
in order for electrons to flow, a circuit must be?
if one of three lights blows our when connected in parallel, what happens to the current in the other two?
it continues to flow
why does the total circuit resistance decrease when more devices are added to parallel circuit?
there are more paths for electron flow
why will too many electric devices operating at one time often blow a fuse or trip a breaker?
excess current is drawn by the devices and exceed the upper limit of the fuse
in order for electricty to flow, electrons will always seek out?
dealing with electricity, the rate of doing work is known as...
which of the following is the correct way to jump a dead battery in a car?
positive of the good to positive bad, negative of good to frame of the car with dead battery
what component of electricity is considered the "pressure"?
the area around the magnet is known as?
the earth's magnetic field is most likely due
convection currents in the molten part of the earth's interior
(t/f) the difference between a piece of ordinary iron and an iron magnet is the alignment of the magnetic domains
what type of current is found in most American homes?
which of the following ways will not disrupt a magnetic alignment within a magnet?
getting a magnet wet
if a galvanometer is calibrated to measure electric potential, it is called?
which of the following is more important in terms of material's overall magnetic field?
electrons spin about their own axis
what is the name of a device that can increase or decrease voltage through magnetic induction?
the North pole of a magnet is placed near the north pole of another magnet. the magnetic force between the 2 magnets will...
which of the following statements is considered correct concerning magnets and their fields?
where the magnetic lines of force are close, the field strength is strong
(t/f) if a current-carrying wire is bent into a loop, the magnetic field inside the loop will cancel to zero
which of the following is a correct statement?
the force on the wire is maximum when the current is perpendicular to the magnetic field lines
if a galvanometer is calibrated to measure current, it is called?
as electricity leaves our power plants, the voltage in the transmission lines would be close to...
the discrepancy between the orientation of a compass and true north is called?
which of the following teams of scientists are credited with the discovery that an electric current can be produced in a wire simply by moving a magnet into and out of a wire coil?
Faraday and Henry
(t/f) voltage is induced whether the magnetic field of a magnet moves past a stationary conductor, or the conductor moves through the magnetic field
Faraday's law states that the induced voltage in a coil is proportional to the product of three things. which of the following is not considered one of them?
the thickness of the insulation on the loop
the machine that produces an electric current by rotating a coil within a stationary magnetic field is known as...
(t/f) the conducting wire experiences no deflection force by a magnetic field as long as the wire carries a current
which of the following represents the number of times each second alternating current changes its magnitude and direction in North America
the production of electricity that we use in our homes, is the result of power plants using steam or water to push paddle wheels called?
the cluster of atoms with their magnetic fields aligned is known as a?
which of the following would be considered the most typical voltage for a step-down transformer to release into our homes and local businesses?
who discovered the speed of electromagnetic waves?
in a step-up transformer, the number of coils in the primary side will be _______ than the secondary side
(t/f) almost all energy today is sold in the form of DC current because of the ease with which it can be transported from one place to another in high power transmission lines
which of the following does not characterize electromagnetic waves
the electric field is parallel to the magnetic field in the waves
if you break a bar magnet in half, each half...
becomes a bar magnet with 2 poles
if you put a small compass in a magnetic field, the compass will...
line up in a direction parallel to the magnetic field
as long as the switch is closed in the primary circuit, which of the following is going to happen?
a magnetic field will exists around the secondary coil
in a vacuum, electromagnetic waves travel at speeds...
equal to the speed of light
the phenomenon of producing a current by using a magnetic field is known as?
if a transformer increased AC voltage, it will also increase
none of the above
(t/f) the magnetic pole in the northern hemisphere is located at the geographic north pole.
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