T5D13: In which type of circuit is DC current the same through all components

Q: In which type of circuit is DC current the same through all components?

The correct answer is A: Series. 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.

Updated: Dec 9, 2025 | Source: 2022-2026 Question Pool | Topic: T5D

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In which type of circuit is DC current the same through all components?

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Deep Dive: T5D13

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.

Why Other Answers 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.

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 Example

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.

Source & Coverage

Question Pool: 2022-2026 Question Pool

Subelement: T5D

Reference: 2022-2026 Question Pool · T5 - Electrical principles

Key Concepts

Series circuit DC current Circuit fundamentals Current flow

Verified Content

Question from the official FCC Technician Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the T5D topic.