How Electromagnetism is used in Electrical Engineering

Components

C = \frac{\kappa\,\varepsilon_0 A}{d}, \qquad Q = CV, \qquad U = \tfrac12 CV^2, \qquad E = \frac{V}{d}

Capacitance and stored energy

H(\omega) = \frac{1}{1 + j\omega RC}, \qquad |H| = \frac{1}{\sqrt{1 + (\omega RC)^2}}, \qquad \phi = -\arctan(\omega RC), \qquad f_c = \frac{1}{2\pi RC}

Impedance and frequency response

C = \frac{\kappa\,\varepsilon_0 A}{d}, \qquad Q = CV, \qquad U = \tfrac12 CV^2, \qquad E = \frac{V}{d}

Capacitance and stored energy

H(\omega) = \frac{1}{1 + j\omega RC}, \qquad |H| = \frac{1}{\sqrt{1 + (\omega RC)^2}}, \qquad \phi = -\arctan(\omega RC), \qquad f_c = \frac{1}{2\pi RC}

Impedance and frequency response