Electrical Engineering › Section J · Series, parallel, and series-parallel ac circuits › Topic J.2
Frequency response of the R-C circuit
Keep the components fixed and sweep the source frequency, and a simple resistor-capacitor circuit changes character completely, from almost pure capacitance to almost pure resistance. That shift is the seed of every filter, tone control and coupling network you will meet.
In this topic
- One circuit, many frequencies
- How each element responds
- The crossover frequency
- Impedance against frequency
- Worked example: a frequency sweep
- The capacitor voltage
- The resistor voltage and the current
- Worked example: choosing a capacitor
- The series R-L circuit by analogy
- Summary: series ac circuits
- Common mistakes to avoid
- Key takeaways
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