Electrical Engineering
Electrical engineering formulas and calculators for circuit analysis, power systems, and electromagnetics used in real-world electrical design. Includes voltage, current, resistance, power, and AC/DC circuit equations.
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Formula of the day
tau = T * r / J
Torsional Shear Stress
When you twist a shaft, shear stress develops inside it. The stress is zero at the center and maximum at the surface. It equals the torque times the radius, divided by the polar moment of inertia. For example, a thin-walled tube can carry almost as much torque as a solid shaft of the same weight because the material is all near the surface where it is most effective. It is used to design drive shafts, axles, and couplings.
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Recently added
view all →Geology & Earth Science/ Seismology
Peak Ground Acceleration Attenuation (Simplified)
Published Jul 11, 2026 Updated Oct 22, 2026
PGA = a * 10^(b*M) / (R+c)^d
Geology & Earth Science/ Seismology
Tsunami Wave Speed (Shallow Water Wave)
Published Jul 11, 2026 Updated Oct 22, 2026
v = sqrt(g*h)
Geology & Earth Science/ Seismology
Fault Slip Rate
Published Jul 11, 2026 Updated Oct 22, 2026
Slip Rate = Total Displacement / Time Elapsed
Geology & Earth Science/ Seismology
Seismic Moment
Published Jul 11, 2026 Updated Oct 22, 2026
M0 = μ * A * D
Geology & Earth Science/ Seismology
Moment Magnitude Scale
Published Jul 11, 2026 Updated Oct 22, 2026
Mw = (2/3)*log10(M0) - 10.7
Geology & Earth Science/ Hydrogeology
Darcy's Law (Groundwater Flow Velocity)
Published Jul 11, 2026 Updated Oct 22, 2026
v = -K * (dh/dl)
Geology & Earth Science/ Hydrogeology
Groundwater Volumetric Flow Rate (Darcy's Law)
Published Jul 11, 2026 Updated Oct 22, 2026
Q = K * A * (dh/dl)
Geology & Earth Science/ Hydrogeology
Hydraulic Conductivity from Intrinsic Permeability
Published Jul 11, 2026 Updated Oct 22, 2026
K = (k * ρ * g) / μ
Geology & Earth Science/ Hydrogeology
Well Drawdown (Thiem Equation, Confined Aquifer)
Published Jul 11, 2026 Updated Oct 22, 2026
s = (Q / (2π*T)) * ln(R/r)
Geology & Earth Science/ Hydrogeology
Aquifer Storativity (Confined Aquifer)
Published Jul 11, 2026 Updated Oct 22, 2026
S = Ss * b
Geology & Earth Science/ Hydrogeology
Specific Yield (Unconfined Aquifer)
Published Jul 11, 2026 Updated Oct 22, 2026
Sy = Volume of Water Drained / Total Volume of Aquifer
Geology & Earth Science/ Hydrogeology
Porosity
Published Jul 11, 2026 Updated Oct 22, 2026
n = (Vv / Vt) * 100
Geology & Earth Science/ Hydrogeology
Groundwater Recharge Rate
Published Jul 11, 2026 Updated Oct 22, 2026
R = P - ET - RO
Geology & Earth Science/ Hydrogeology
Well Specific Capacity
Published Jul 11, 2026 Updated Oct 22, 2026
Sc = Q / s
Geology & Earth Science/ Hydrogeology
Groundwater Seepage (Linear) Velocity
Published Jul 11, 2026 Updated Oct 22, 2026
v_s = v / n
Geology & Earth Science/ Hydrogeology
Stream Discharge
Published Jul 11, 2026 Updated Oct 22, 2026
Q = V * A
Geology & Earth Science/ Hydrogeology
Stream Gradient
Published Jul 11, 2026 Updated Oct 22, 2026
Gradient = Elevation Drop / Stream Length
Geology & Earth Science/ Seismology
Rock/Mineral Density (Specific Gravity)
Published Jul 11, 2026 Updated Oct 22, 2026
SG = Density of Sample / Density of Water
Geology & Earth Science/ Hydrogeology
Gravimetric Soil Moisture Content
Published Jul 11, 2026 Updated Oct 22, 2026
w (%) = ((Mass_wet - Mass_dry) / Mass_dry) * 100
Geology & Earth Science/ Hydrogeology
Drainage Basin Relief Ratio
Published Jul 11, 2026 Updated Oct 22, 2026
Rh = Relief / Basin Length
Geology & Earth Science/ Hydrogeology
Flood Recurrence Interval (Weibull Formula)
Published Jul 11, 2026 Updated Oct 22, 2026
T = (n+1) / m
Biology/ Genetics
Hardy-Weinberg Equilibrium
Published Jul 8, 2026 Updated Oct 22, 2026
p² + 2pq + q² = 1
Biology/ Genetics
Punnett Square Ratio (Monohybrid)
Published Jul 8, 2026 Updated Oct 22, 2026
Genotype ratio = 1:2:1
Biology/ Population Ecology
Logistic Population Growth
Published Jul 8, 2026 Updated Oct 22, 2026
dN/dt = rN(1 − N/K)
Biology/ Population Ecology
Michaelis-Menten Kinetics
Published Jul 8, 2026 Updated Oct 22, 2026
v = V_max[S] / (K_m + [S])