OhmPediaPassive Components and Laws

Passive Components and Laws

无源元件与基本定律 · I

Resistance, capacitance, inductance and the laws that constrain them. Nothing here supplies energy; everything here absorbs, stores or redistributes it.

Entries in this section 4 / 8

1. CapacitanceC = Q / V

   The ability of two insulated conductors to store charge, one coulomb per volt.

2. ImpedanceZ = R + jX

   The complex generalisation of resistance that also accounts for energy stored and returned by capacitance and inductance.

3. Kirchhoff's Circuit LawsΣ I = 0 (node) · Σ V = 0 (loop)

   Charge and energy conservation applied to a circuit: currents into a node sum to zero, voltages around a loop sum to zero.

4. ResistanceR = ρ · l / A

   The property of a material that converts electrical energy to heat at a rate proportional to the square of the current.