Capacitors act like a short circuited at high frequencies and an open circuited at low frequencies. By the Capacitive reactance formula:
Xc = 1 / 2 π f C
Xc → reactance in ohms (W)
f → frequency in hertz (Hz)
C → capacitance in farads (F)
If capacitor act as open circuit for DC or low frequency signals then how it can be used in DC circuits?
CAPACITOR IN SERIES AND CAPACITOR IN PARALLEL
Here are two cases:
CAPACITOR IN SERIES WITH SIGNAL
In this situation, AC is able to pass through, but DC gets blocked. This is commonly called a coupling capacitor.
CAPACITOR IN PARALLEL WITH SIGNAL
In this situation, DC is able to get through, but AC is shorted to ground causing it to be blocked. This is commonly called a decoupling capacitor.
Now let implement this within the series and parallel circuits (don’t worry about resistor we will see cover this in next topic)
CAPACITOR IN SERIES – LED WILL NOT GLOW
CAPACITOR IN PARALLEL – LED WILL GLOW
DIFFERENT TYPES OF CAPACITOR