Lab Final Flashcards
d(PV)=0
dT=0
dE=0
The PV=constant implies that
the momentum exchange from collisions b/w molecules as a function of temp
The force exerted by collisions b/w molecules and the walls where the gas is contains
how fast gas molecules move and collide under different temps
The ideal gas law
The term P*V in ideal gas law has units of
Joule
An adiabatic process exchanges
zero heat with the environment
Joule’s law describes
the relationships b/w power of the source providing the heat, time, and temperature
the specific hear of two different liquids at the same temperature and pressure are
likely different
Two beakers contain two liquids of the same mass. We heat them up to the same final temperature, w/o any phase changes occurring. The liquid that overall heats up faster has
smaller specific heat than the other
Heat is a form of energy that relates to the
energy flow from hot to cold
When a body of water is evaporating then its temperature is
dropping
A very fast gas decompression under a constant volume results in a sudden temperature
drop
The inductive charging acquires the opposite charge than the main Van de Graaf dome is because
The repelling forces between electrons
The charges on a randomly-shaped conductor always reside
at the surface
There are free electrons in the air we breath T/F
true
The reason air “breaks down”
Electrons accelerate and knock off orbiting electrons thus creating ions
One argues that because the proton is much larger in mass than the electron, it creates a much stronger electric field at the same distance than the electron does. T/F
False
A student argues that the sound that is produced during VDG spark is due to the thermal expansion of the surrounding air. T/F
True
The size of the VDG dome determines
How much charge is stored, how long the sparks can reach, the electric potential magnitude on the surface of the sphere
The electric field at the center of the VDG dome is
Zero
Ohm’s law is always observed across all electronic devices. T/F
False
Three 10-Ohm resistors in series made from the same material always share the same
current, voltage, resistivity
Ohm’s law in AC and DC domain treats the equivalent resistance the exact same way. T/F
True
In the lab we experimented on resistors in series in the AC domain. When we increased the frequency without changing anything else, we observed that the current of the circuit
Remained the same
Momentum exchange between electrons is one of the parameters that determines the resistivity of a wire. T/F
True
The relative mean square (rms) quantity for electric potential in AC is ALWAYS
Greater than the numerical average of AC electric potential
The basic function of an oscilloscope is to return the electric potential difference across ANY element in a circuit with respect to
Ground
The resistance of the semi-conductor we studied in the lab
Exhibited a normal non-Ohmic behavior
Both Kirchoff rules are NOT valid for AC current. T/F
False
The phase difference between the voltages of two resistors in series connected to AC depends on
Frequency
Both Kirchoff rules are NOT valid for AC current. T/F
False
The plates of an isolated parallel plate capacitor with a capacitance C carry a charge Q. What is the capacitance of the capacitor if the charge is increased to 2Q?
C
When the capacitor is fully charges in DC the current in the circuit is
zero
Two capacitors in series that have the same charge density and same plate separation will always have the same
Capacitance, voltage, charge
In an AC (sine-wave) domain, the time-series of the voltages b/w the capacitor and the entire resistor will ALWAYS be
exactly 90 degrees out of phase
In an AC (sine-wave) domain, the time-series of the voltages b/w the capacitor and the entire circuit will ALWAYS be
none of these
The capacitance will increase if one
Increase the plate separation
Consider a capacitor and resistor in series in AC (sine-wave) domain. Does the time series of the voltage across the capacitor ever become zero?
no
One of the major differences between DC and AC (sine-wave) is that when the circuit includes a capacitor is that
Capacitor has resistance, but dependent on frequency
Capacitance depends on frequency
As AC (sine-wave) frequency increases in an RC in series, then the rms voltage across the resistor
approaches the RMS of the source
