🔍 Key Concepts

• Bypass capacitor function in electronic circuits • How a capacitor behaves with DC (direct current) versus AC (alternating current) • How impedance of a capacitor changes with frequency

💭 Think About

• Think about whether a capacitor passes or blocks DC once it is fully charged, and how that compares to what it does with AC signals. • Ask yourself: in the phrase "bypass capacitor," what is being bypassed — DC, AC, or something else — and where is it being bypassed to? • Consider how placing a capacitor from a signal line to ground affects high‑frequency components versus steady DC level.

✅ Before You Answer

• Verify how a capacitor’s reactance (impedance) changes as frequency increases (low vs high frequency, DC included). • Check which option correctly describes what is being shunted to ground (DC or AC) in typical bypass or decoupling applications. • Confirm that the purpose of a bypass capacitor is related to stabilizing or cleaning a supply or signal line, not mainly to tuning or impedance transforming.