In which type of circuit is DC current the same through all components?
The correct answer is A: Series. In a series circuit, DC current is the same through all components. This is a fundamental characteristic of series circuits - all components are connected end-to-end, so the same current flows through each one.
In a series circuit, components are connected in a single path, so current has only one path to follow. This means the current is identical at every point in the circuit. The current is determined by the total voltage and total resistance (I = E / R_total). This is different from parallel circuits, where current divides among branches. Understanding series circuits is essential for circuit analysis, troubleshooting, and design.
Exam Tip
Series circuit = Same current everywhere. Remember: In series circuits, DC current is the same through all components because there's only one path for current flow.
Memory Aid
"**S**eries = **S**ame **C**urrent (think 'S = SC')"
Real-World Application
You're building a simple LED circuit with three LEDs in series. When you connect them to a battery, the same current flows through all three LEDs because they're in a single path. If you measure current at any point in the circuit, you'll get the same value - this is the characteristic of a series circuit.
Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. In parallel circuits, current divides among branches - each branch can have different current. The same current does not flow through all components.
Option C: Incorrect. Resonant circuits refer to circuits that resonate at specific frequencies (like LC circuits), not a circuit type where current is the same through all components.
Option D: Incorrect. Branch circuits are parts of parallel circuits where current divides, so current is not the same through all components.
题目解析
The correct answer is A: Series. In a series circuit, DC current is the same through all components. This is a fundamental characteristic of series circuits - all components are connected end-to-end, so the same current flows through each one. In a series circuit, components are connected in a single path, so current has only one path to follow. This means the current is identical at every point in the circuit. The current is determined by the total voltage and total resistance (I = E / R_total). This is different from parallel circuits, where current divides among branches. Understanding series circuits is essential for circuit analysis, troubleshooting, and design.
考试技巧
Series circuit = Same current everywhere. Remember: In series circuits, DC current is the same through all components because there's only one path for current flow.
记忆口诀
**S**eries = **S**ame **C**urrent (think 'S = SC')
实际应用示例
You're building a simple LED circuit with three LEDs in series. When you connect them to a battery, the same current flows through all three LEDs because they're in a single path. If you measure current at any point in the circuit, you'll get the same value - this is the characteristic of a series circuit.
错误选项分析
Option B: Incorrect. In parallel circuits, current divides among branches - each branch can have different current. The same current does not flow through all components. Option C: Incorrect. Resonant circuits refer to circuits that resonate at specific frequencies (like LC circuits), not a circuit type where current is the same through all components. Option D: Incorrect. Branch circuits are parts of parallel circuits where current divides, so current is not the same through all components.
知识点
Series circuit, DC current, Circuit fundamentals, Current flow
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.