- 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)
- XC = V ÷ I
- I = V ÷ XC
- V = I × XC
- XC = 1 ÷ (2πƒC)
- Reactance decreases as frequency increases