xx Flashcards
Ohm’s Law for Circuits
V
V = IR
V Voltage Volt
I Current Amps
R Resistance Ohm
Effective Resistance
Parallel Circuit
Reff
Reff= (1/R1 + 1/R2 + 1/R3…)^-1
Effective Resistance Series Circuit
Reff
Reff= R1+R2+R3
Electric Power
P
P = VI = R(I)^2
P Power
V Voltage Volts
I Current Amps
Kinetic Energy
Ek
Ek= 1/2 * m * v^2
Ek Kinetic Energy
m mass Kg
v velocity m/s
Gravitational Energy
Eg
Eg = mgh
Eg Gravitational energy
m mass kg
g gravity -9.8m/s^2
h vertical height (height above sea level m)
Work Energy
W
W = Fs
W work J
F force
s displacement
Newton’s Second Law
F
(sum of) F = ma
F force
m mass kg
a acceleration m/s^2
Torque
T
T = Fr
T Torque
F Force
r perpendicular radius
Gas Law
PV = nRT
P pressure atm
V volume L
n moles
R gas constant
T temperature Kelvin
Density
p
p = m/v
p density g/cm^3 or kg/m^3
m mass
v volume
Pressure
p
P= F/A
P pressure
F force applied
A Area
Momentum
P
P = mv
P momentum
m mass kg
v velocity m/s
Wave Theory
Frequency
F
f = 1/T
f frequency Hz λ/sec
T period of wave (s) - time take for WL to pass through
OR
f = no. cycles/Time
Wave Theory
Velocity
V
V = fλ
V velocity m/s
f frequency Hz
λ wavelength (m)
Rate of Change
(y2-y1)/(x2-x1)
Gradient m
m = (y2-y1)/(x2-x1)
y= mx + c
Average Speed
s
s= total distance/time
Average Velocity
(u+v)/2
or
(x2-x1)/(t2-t1)
change in x/change in t
change in displacement/change in time
Average Acceleration
v-u/t
change in v / change in t
E cell potential
E cell = E red + E ox
Gibbs’ Free Energy
ΔG
ΔG = ΔH- TΔS
ΔG change in Gibbs Free Energy
ΔH change in enthalpy
ΔS change in entropy
T temperature K
Air Optical Density Refraction
n = 1.0
where
if n2>n1, θr < θi
if n2<n1, θr>θi
Dimensional analysis
P = f/a.
f = ma
v = s/t
a = s/t^2
q = it (charge = current x time)
w = fs (use this for energy)