Engineering Board Exam Reviewer · Time Response of Reactive Circuits · medium
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 voltage across the resistance at the instant after switching?
- 50 V
- 36.8 V
- 200 V
- 100 V
Answer
D. 100 V
Solution
The inductor current cannot change instantly, so the 2 A continues through the resistance: v=iR=(2)(50)=100 V (decaying afterward with =L/R=4 ms).
More Time Response of Reactive Circuits questions
- If the resistance in a series RC charging circuit is doubled while C is unchanged, the time constant
- In an RC charging circuit, the current at t=3 is what percentage of the initial current?
- A 100, F capacitor charged to 100 V discharges through a 10 k resistor. How long does it take for the voltage to fall to 10 V?
- A 100, resistor is in series with a 0.5 H inductor and a dc source. After the switch closes, how long does it take for the current to…
- How much energy is stored in the magnetic field of a 2 H inductor carrying 0.5 A?
- How much energy is stored in a 100, F capacitor charged to 24 V?
- The curve shows the capacitor voltage after a switch connects an uncharged capacitor in series with a 2 k resistor to a dc source. The…
- The switch in the RL circuit shown closes at t=0 with no initial current (V=6 V, R=100, , L=200 mH). Find the voltage across the inductor…
- The switch in the RL circuit shown closes at t=0 with no initial current (V=24 V, R=40, , L=4 H). Find the current at t=100 ms.
- The capacitor shown is charged to 50 V when the switch closes at t=0 and discharges through R=20 k (C=22, F). Find the capacitor voltage…