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In a first-order RC circuit, what happens to the voltage across the capacitor af

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Question: In a first-order RC circuit, what happens to the voltage across the capacitor after 5 time constants?

Options:

  1. It is at 100% of V0
  2. It is at 63.2% of V0
  3. It is at 86.5% of V0
  4. It is at 50% of V0

Correct Answer: It is at 100% of V0

Solution: 

After 5 time constants, the voltage across the capacitor in a first-order RC circuit is effectively at 100% of the supply voltage V0.

In a first-order RC circuit, what happens to the voltage across the capacitor af

Practice Questions

Q1
In a first-order RC circuit, what happens to the voltage across the capacitor after 5 time constants?
  1. It is at 100% of V0
  2. It is at 63.2% of V0
  3. It is at 86.5% of V0
  4. It is at 50% of V0

Questions & Step-by-Step Solutions

In a first-order RC circuit, what happens to the voltage across the capacitor after 5 time constants?
  • Charging of Capacitor – In a first-order RC circuit, the voltage across the capacitor increases exponentially and approaches the supply voltage over time.
  • Time Constant – The time constant (Ï„) is the time it takes for the voltage to reach approximately 63.2% of the supply voltage, and after 5 time constants, it is considered to be fully charged.
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