What is the term for the time required for the capacitor in an RC circuit to be charged to 63.2% of the applied voltage or to discharge to 36.8% of its initial voltage?
The correct answer is B: One time constant. What is the term for the time required for the capacitor in an RC circuit to be charged to 63.2% of the applied voltage or to discharge to 36.8% of its initial voltage is one time constant. Time constant (τ = RC) is the time for 63.2% charge or 36.8% discharge. For amateur radio operators, this is important for circuit theory. Understanding this helps when working with RC circuits.
Exam Tip
Time for 63.2% charge or 36.8% discharge = one time constant. Think 'T'ime 'C'onstant = 'T'ime for '6'3.2%/'3'6.8%. Time constant (τ = RC) is the time for 63.2% charge or 36.8% discharge. Not exponential rate, not exponential period, not time factor - just one time constant.
Memory Aid
"Time for 63.2% charge or 36.8% discharge = one time constant. Think 'T'ime 'C'onstant = '6'3.2%/'3'6.8%. Time constant (τ = RC) is the time for 63.2% charge or 36.8% discharge. Important for circuit theory."
Real-World Application
A capacitor in an RC circuit: The time required for it to be charged to 63.2% of the applied voltage or to discharge to 36.8% of its initial voltage is one time constant (τ = RC). This is the term - one time constant.
Key Concepts
Why Other Options Are Wrong
Option A (An exponential rate of one): Incorrect. Exponential rate of one isn't the term - one time constant is the term. Exponential rate isn't the term.
Option C (One exponential period): Incorrect. One exponential period isn't the term - one time constant is the term. Exponential period isn't the term.
Option D (A time factor of one): Incorrect. Time factor of one isn't the term - one time constant is the term. Time factor isn't the term.
题目解析
The correct answer is B: One time constant. What is the term for the time required for the capacitor in an RC circuit to be charged to 63.2% of the applied voltage or to discharge to 36.8% of its initial voltage is one time constant. Time constant (τ = RC) is the time for 63.2% charge or 36.8% discharge. For amateur radio operators, this is important for circuit theory. Understanding this helps when working with RC circuits.
考试技巧
Time for 63.2% charge or 36.8% discharge = one time constant. Think 'T'ime 'C'onstant = 'T'ime for '6'3.2%/'3'6.8%. Time constant (τ = RC) is the time for 63.2% charge or 36.8% discharge. Not exponential rate, not exponential period, not time factor - just one time constant.
记忆口诀
Time for 63.2% charge or 36.8% discharge = one time constant. Think 'T'ime 'C'onstant = '6'3.2%/'3'6.8%. Time constant (τ = RC) is the time for 63.2% charge or 36.8% discharge. Important for circuit theory.
实际应用示例
A capacitor in an RC circuit: The time required for it to be charged to 63.2% of the applied voltage or to discharge to 36.8% of its initial voltage is one time constant (τ = RC). This is the term - one time constant.
错误选项分析
Option A (An exponential rate of one): Incorrect. Exponential rate of one isn't the term - one time constant is the term. Exponential rate isn't the term. Option C (One exponential period): Incorrect. One exponential period isn't the term - one time constant is the term. Exponential period isn't the term. Option D (A time factor of one): Incorrect. Time factor of one isn't the term - one time constant is the term. Time factor isn't the term.
知识点
Time required, Capacitor in RC circuit, Charged to 63.2%, Discharge to 36.8%, One time constant
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.