Engineering Board Exam Reviewer · Time Response of Reactive Circuits · easy
After how many time constants is a charging capacitor generally considered to be fully charged?
- 1
- 2
- 5
- 10
Answer
C. 5
Solution
After 5 the capacitor voltage has reached 1-e-5=99.3% of its final value, which is usually taken as fully charged.
More Time Response of Reactive Circuits questions
- The switch in the series RL circuit shown closes at t=0 (V=15 V, R=50, , L=1 H). Find the time constant.
- In the circuit shown the capacitor is uncharged when the switch closes at t=0 (V=30 V, R=5 k , C=10, F). What current flows in the circuit…
- The switch in the circuit shown closes at t=0 with the capacitor initially uncharged. The source is 6 V, R=10 k , and C=1, F. Find the…
- A 10, F capacitor charged to 50 V is connected through a resistor across an identical uncharged 10, F capacitor. How much energy is…
- An RC circuit has a time constant of 0.1 s. After the switch connects it to a dc source, how long does the (initially uncharged) capacitor…
- A 5, F capacitor charged to 100 V discharges through a 2 M resistor. What is the capacitor voltage 10 s after the discharge begins?
- The capacitor in the circuit shown already holds 6 V (same polarity as the source) when the switch closes at t=0 (V=24 V, R=10 k , C=10…
- In the circuit shown the capacitor is uncharged and the switch closes at t=0 (V=30 V, R1=2 k , R2=3 k , C=10, F). Find the capacitor…
- A 0.2 H coil carrying 2 A is suddenly switched so that its current must flow through a total resistance of 50, (no source). What is the…
- If the resistance in a series RC charging circuit is doubled while C is unchanged, the time constant