Electric circuit and capacitance

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SUMMARY

When parallel plate capacitors are introduced into a circuit, the behavior of current flow differs significantly between direct current (DC) and alternating current (AC). In a DC circuit, if the insulating material between the capacitor plates is perfect, no current passes as the charges are stored. Conversely, in an AC circuit, current displacement occurs due to the changing voltage, leading to varying impedance with frequency. Understanding these principles is crucial for effective circuit design and analysis.

PREREQUISITES
  • Basic understanding of electric circuits
  • Knowledge of capacitor behavior in DC and AC circuits
  • Familiarity with impedance and its frequency dependence
  • Concept of charge storage in capacitors
NEXT STEPS
  • Research the behavior of capacitors in AC circuits, focusing on impedance variations
  • Study the differences between DC and AC voltage applications on capacitors
  • Explore the concept of current displacement in capacitors under AC excitation
  • Learn about the role of dielectric materials in capacitor performance
USEFUL FOR

Electrical engineers, electronics students, and anyone interested in understanding the behavior of capacitors in various circuit conditions.

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Does current pass when parallel plate capacitors are introduced in circuit?
 
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shayan haider said:
Does current pass when parallel plate capacitors are introduced in circuit?

What are your thoughts? How does a capacitor behave for DC and AC voltages?
 
I think so that as the current is flow of charges but in this case the charges are being stored therefore current should not pass? Correct me if I am wrong.
 
shayan haider said:
I think so that as the current is flow of charges but in this case the charges are being stored therefore current should not pass? Correct me if I am wrong.

The key is in my hint about AC versus DC excitation voltages. What sources have you been using for reading/learning about capacitors and electronics? What do they say about your question?
 
berkeman said:
The key is in my hint about AC versus DC excitation voltages. What sources have you been using for reading/learning about capacitors and electronics? What do they say about your question?
It says that if the insulator between plates is perfect insulating material then no current passes and vice versa. If the source is DC, the current leakage would be low but if it is AC then there would be current displacement.
 
Correct. So how does the impedance of a capacitor vary with AC frequency?
 

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