Equation Recap Flashcards
Charge
Q = It
Current in terms of charge
I =Q/t
Voltage
V = IR
Ohms law equation
V dp to I so V=IR
Resistance equation
R = V/I
Resistors in series equation
R1 + R2 + … = totalR
Resistors in parallel
1/R1 + 1/R2 all under 1
Force equation
F = ma
Acceleration
a = v-u/t
Aka 🔺V/ 🔺t (triangle is delta)
Speed on distance time graphs
The gradient (s=d/t)
GPE
GPE = mgh
KE
KE = 1/2mv squared
Work done equation
W = fd
Power with energy
P= E/t
Efficiency
Useful output/total output = %
Energy transferred in a circuit
E = IVt
Specific heat capacity
E = mc 🔺T
Density
Rho = mass / volume
Kg/m3 or g/cm3
Pressure
p = F/A
Pressure manometer
p = rho gh
density of liquid x 🔺height x gravity (10)
Hooke’s law (effect of forces)
F = kx
K = gradient
X = extension
Moments
M (torque) = Fd
Force x perpendicular distance from the pivot
Moments unit
Nm
Momentum
p = mv (mass x velocity)
Force in terms of momentum
F = 🔺p / 🔺t
F = change in momentum / time
Impulse equation
Impulse = change in momentum = Ft
Conservation of moments
Total momentum before = total momentum after
Velocity of wave
V = f λ
Frequency (Hz) x wavelength (m)
Time period for a wave to be made
T = 1/frequency
What is the range of human hearing?
20-20,000Hz
Law of reflection
angle of incidence = angle of reflection
Refractive index
n = sin(i) / sin(r)
Critical angle
C = sin-1 (1/n)
Transformer equation voltage and current
Ip x Vp = Is x Vs
Transformer equation turns and voltage
Vp/ Vs = np/ ns
Speed distance time equation
S = d/t
Weight equation
W = mg
Work done in terms of energy
Energy transferred = work done
Resistance equation
R = V/I
Isotope notation top number meaning
Protons + neutrons
Isotope bottom number meaning
proton number
Acceleration equation
a = change in velocity/time
Work done equation
W = Fd
Power equation
W/t or Fd/t or 🔺energy/t
Pressure in a liquid equation
p = h(rho)g
Pressure of a gas equation
pV = pV
Thermal capacity of an object equation
C = mc
Lower c = SHC
Specific heat capacity
Energy = mc🔺T
Speed of a wave
v = f x wavelength
1V = ?
1V = 1J/C
Power equation with voltage
P = IV
Gravitational field strength equation
g = w/m (N/Kg)
Orbital speed equation
Circumference (twoxpixradius) / time (secs)
One light year
9.5x10 ^15 m
Refractive index with velocity and critical angle
n = c/v
Energy charge voltage equation
E = QV
Age of the universe equation
d/v = 1/hubbles constant
Hubbles constant equation
Ho = v/d
Power current equation
P = IV
Voltage energy equation
V = E/Q
Energy in terms of power
E = Pt
Refractive index with critical angle equation
n = c/v
Hubbles constant
2.2 x 10^-18
1 light year
9.5 x 10^15 m
Speed of electromagnet radiation and light
3x10^8m/s
The earths axis tilt
23.4°
°c -> kelvin
+273
Speed of sound in water
900-2000m/s
Speed of sound in solid
6000m/s
Power resistance equation
P = I squared x R
