Physics Circuits Flashcards
Charge q on a capacitor formula
Q = CV
Capacitance formula
C = A/ Distance
Intensity formula
I = P / A = (Energy * time) / Area
More gamma rays -> more intensity
Greater dose increases gamma ray intensity
Electromagnetic radiation
Current formula with charge
I = Q / time
Q = I * time
Voltage formula
V = IR
What is electrical conductivity?
How easily a current can move through a material and it is inversely proportional to electrical resistance
W apparent formula
W apparent = W air - Fb
Formula for specific gravity
p substance / p water
when submerged in water specific gravity = Weight / Fb
When force is applied to an object in water, velocity ..
Increased but when the force is removed, velocity is constant
Capacitance it dielectric materials formula
In series circuit voltage … while current …
Different
Current is the same
In parallel circuit voltage is … while current is ..
Voltage is the same
Current is different
Ohms law
Resistance formula
R eq and Ceq in series
Req = R 1 + R2 + R 3
1/C eq = 1/C1 + 1/C2 +
Req and Ceq in parallel
C eq = C1 + C 2 + C 3
1/Req = 1/R1 + 1/ R2
Conductivity characteristics
Describes how east charges flow through the molecular structure of the given material.
Directly proportional to electric conductor
But inversely proportional to resistivity
Most metals are highly conductive while no metals are nonconductive.
Salt solution are high conductivity while weak acid solution is low and simple alcohol no conductivity at all.
When conductivity high, current also high and vice versa
Energy in a capacitor formula
U = 1/2 CV^2 = 1/2 QV = 1/2 Q^2/ C
SI units
Electric power formula
Electric charges can be
Positive and negative
Current formula with time
I = Q/ t
Q - charge in C
What is confounding variable?
Uncontrolled variable than affect the DV
In parallel circuit when one resistor is gone the the Req
Increases
And when one more resistor is added, then Req decreases
Lorentz force vs centripetal force
Lorentz force- force exerted in an ion in a magnetic field
Electric field characteristics
A space that exerts a force on charged particles
E= V/ d
N/C = V/m
Electrostatic force on a charge in an electric field
F = qE
Charge Q on a an object is
Q = n e
e = - 1.6 * 10^-18
What is electromotive force?
Energy that is supplied by a battery to move charge through a circuit
Electric charge is conserved therefore
Charge cos not be created or destroyed
In a closed system total charge is constant
Electrical insulators and conductors
Conductors - allow the flow of electric charges when they are exposed to a voltage
Insulators - do not contain mobile charge carriers and do not allow electric charges to flow when a voltage is applied
Magnetic fields are generated by?
Electromagnetic radiation, permanent magnets and motion of charged particles
Acceleration formula
Power with work
P = W/t = E/t
In order to achieve accurate voltage measurements, voltmeter should have
A very large resistance
How to calculate q from Coulomb’s law?
q= (Er^2)/ k
Heat energy q is directly proportional by a resistor to
Its electric power
Relationship between Fe and Fg
F = Fe -Fg
When Fe > Fg => moves toward the hand
If opposite then away
Decibel scale of the sound intensity
dB = 10 log I1/I2
What is work done by Lorentz force in electron?
Zero
kEv to Ev
1 kEV = 1000 Ev
Intensity formula
P/A = (energy/time) / area
More gamma rays = more intensity
