Electrical Engineering XYZ MCQs
In case of DC, a capacitor acts:
- Open
- Short
- As Resistor
Correct answer: 1. Open
Explanation: In the case of DC, a capacitor acts as an open circuit. Initially, when a DC voltage is first applied to a capacitor, the capacitor charges up to the voltage level. During this charging period, a current flows, but once the capacitor is fully charged, it reaches a state where it effectively blocks any further current from flowing through it. This happens because a capacitor opposes changes in voltage across its plates and, once charged to the supply voltage, no voltage difference remains to drive current. Consequently, after the initial charging phase, the capacitor behaves like an open circuit in a DC circuit, allowing no current to flow.