Capacitance resists direct current at constant state

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Question: Capacitance resists direct current at constant state
Options: a. True  b. False  c. I can't say

Option a: True
- At first glance, one might think a capacitor resists any change in current, since it blocks DC once it is fully charged. However, the statement as written claims that capacitance resists direct current at constant state. The subtlety lies in distinguishing resistance (a property of a resistor) from the behavior of a capacitor. A capacitor does not have a constant resistance; instead, in DC steady state a capacitor acts as an open circuit because no continuous DC current can flow once it is charged. Saying it “resists direct current” is imprecise because resistance is a property of materials and components that continuously oppose current, whereas a capacitor’s current behavior depends on time and the charging process. Therefore this option mischaracterizes the fundamental role of capacitance in DC conditions.

Option b: False
- The correct interpretation is that a capacitor does not continually allow direct current to flow at DC steady state. After charging, the current through a capacitor in a DC circuit becomes zero, which is why a capacitor is modeled as an open circuit in steady-state DC analysis. Since the statement asserts that capacitance resists DC at constant state, and the actual behavior is that DC is blocked after charging (no continuous DC current flows), describing this as a property of capacitance is not accurate in the sense of resistive opposition. Hence the claim is not an accurate universal description of capacitor behavior in DC steady state, which is why this option is selected as false in typical assessments of the concept.

Option c: I can't say
- This option would be chosen only if there were insufficient information about the circuit context or about the exact meaning of the phrase in the statement. In standard electrical theory, we know how capacitors behave with DC in steady state, so there is enough information to judge the claim. Choosing this option would generally reflect uncertainty rather than a conceptual ambiguity.

Summary of reasoning across options
- The statement mixes the idea of resistance with capacitor behavior under DC. The key point is that a capacitor does not pass DC continuously; after charging, the DC current is zero, which is not the same as a resistor resisting current in a steady, ohmic sense. Thus the claim is not an accurate descriptor of capacitance behavior in constant DC conditions, making option b the appropriate choice in this framing. The other options are incorrect because they either misattribute the nature of resistance to a capacitor (option a) or assume insufficient information (option c).

BL30A0001 Electric Circuits - Blended teaching 6.1.2025-20.4.2025 Continuous evaluation final test, open 21.4.-26.4.2025

Capacitance resists direct current at constant state

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