Capacitive Reactance. Flow in a pipe can be blocked by an elastic membrane. Provides restoring spring force A capacitor blocks the flow of direct current. Gap between plates The charge provides a restoring potential. AC current can flow. Rubber Sheet. r vA. i. C.
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Provides restoring spring force
A capacitor blocks the flow of direct current.
Gap between plates
The charge provides a restoring potential.
AC current can flowRubber Sheet
One loop circuit
The capacitor charge varies with the voltage.
The current is related to the rate of change of the charge.AC Driver
The ratio gives an expression like Ohm’s law.
This is the capacitive reactance.
Measured in ohmsAlmost Ohm
Capacitive reactance depends inversely on frequency.
High reactance at low frequency
Low reactance at high frequencyFrequency Dependent
Find the capacitive reactance of a 0.100 mF capacitor at an audio frequency of 100 Hz and at an FM-radio frequency of 100 MHz.
The formula for capacitive reactance depends on frequency.
Frequency f in Hz
Find the reactance in ohms.
1/(2p 102 Hz 10-7F)= 16 kW
1/(2p 108 Hz 10-7F)= 16 mW
Note that there is virtually no resistance at radio frequency.Audio Cutoff