In a series circuit, which of the parameters remain constant across all circuit elements such as res

Question

In a series circuit, which of the parameters remain constant across all circuit elements such as resistor, capacitor and inductor etcetera?

Examoogle · Accepted Answer

Current

Explanation: In a series circuit, there is only one continuous path for the current to flow through all connected elements. Consequently, the magnitude of the current is identical at every point within the series loop.

Working Principle: According to Kirchhoff's Current Law (KCL), the algebraic sum of currents entering a node must equal the sum of currents leaving it. Since a series connection contains no intermediate nodes (junctions) between elements, the current must remain uniform throughout the entire circuit path ($I_{total} = I_1 = I_2 = I_3$).

Key Formulas: $I_{total} = I_R = I_L = I_C$ — Current equivalence in a series RLC circuit; $V_{total} = V_R + V_L + V_C$ — Kirchhoff's Voltage Law (KVL) for series circuits

Key Points: A series circuit provides a single path for charge flow.; Voltage across elements in a series circuit depends on their respective impedances ($V = I \cdot Z$).; Kirchhoff's Voltage Law (KVL) governs the distribution of potential difference in series circuits.

Advantages: Simple circuit construction; Easy to control total current with a single switch

Disadvantages: If one component fails, the entire circuit path is broken; Voltage drops across individual components may vary significantly depending on impedance

Applications: String lights (traditional types); Fuses and protective circuit breakers; Voltage divider networks

Additional Info: Voltage is only constant in a series circuit if the impedance of all elements is identical, which is rarely the case.. Option A is incorrect because voltage divides across series elements proportional to their impedance ($V_k = I \cdot Z_k$).

Answer: B is correct — In a series circuit, there is only one path for the electrons to flow, which ensures that the current remains constant through every component.

Exam Tip: Always remember that in parallel circuits, it is the voltage that remains constant across elements, while in series circuits, it is the current that remains constant.

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