10 most commonly used formulas in electrical engineering:
1. Ohm's Law: V = IR, where V is the voltage, I is the current, and R is the resistance.
2. Power formula: P = VI, where P is the power, V is the voltage, and I is the current.
3. Resistivity formula: ρ = RA/L, where ρ is the resistivity, R is the resistance, A is the cross-sectional area, and L is the length.
4. Capacitance formula: C = Q/V, where C is the capacitance, Q is the charge, and V is the voltage.
5. Inductance formula: L = Φ/I, where L is the inductance, Φ is the magnetic flux, and I is the current.
6. Kirchhoff's Laws: Kirchhoff's Current Law (KCL) and Kirchhoff's Voltage Law (KVL) are used to analyze electrical circuits.
7. Fourier series formula: f(x) = a0/2 + ∑(n=1 to ∞) [an cos(nx) + bn sin(nx)], where f(x) is a periodic function, a0 is the DC component, and an and bn are the Fourier coefficients.
8. RMS voltage formula: Vrms = Vmax/√2, where Vmax is the maximum voltage.
9. Impedance formula: Z = R + jX, where Z is the impedance, R is the resistance, and X is the reactance.
10. AC power formula: P = VrmsIrmscos(θ), where P is the power, Vrms and Irms are the RMS voltage and current, respectively, and θ is the phase angle.