Capacitors

Capacitive Reactance

  • When a.c. is applied to a capacitor it will charge it, first in one direction, then the other, i.e. a current flows
  • The ratio of voltage to current is the reactance (XC) measured on Ohms (Ω)
    1. XC = V ÷ I
    2. I = V ÷ XC
    3. V = I × XC
  • XC = 1 ÷ (2πƒC)
  • Reactance decreases as frequency increases