In the electric circuit shown, each cell has an e.m.f of 2 V and internal resistance of 1 Ω. Th

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In the electric circuit shown, each cell has an e.m.f of 2...

In the electric circuit shown, each cell has an e.m.f of $2 \mathrm{~V}$ and internal resistance of $1 \Omega$. The external resistance is $2 \Omega$ the value of the current (I) is.
(A) $0.8 \mathrm{~A}$
(B) $0.6 \mathrm{~A}$
(C) $0.4 \mathrm{~A}$
(D) $0.1 \mathrm{~A}$

Key Concepts

Ohm's Law

Ohm's Law is a fundamental principle in circuit analysis which states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance. This relationship, expressed as I = V/R, is essential for calculating current, voltage, or resistance in any electrical circuit.

Electromotive Force (EMF)

Electromotive Force, or EMF, is a measure of the energy provided by a battery or cell per unit charge. It represents the potential difference generated by the source when no current is flowing, serving as a driving force for the movement of electrons through a circuit.

Internal Resistance

Internal resistance refers to the inherent resistance within a power source, such as a battery or cell, that opposes the flow of current. This resistance causes a voltage drop inside the source and affects the overall efficiency and performance of the circuit, especially when combined with other resistances in series.

External Resistance

External resistance is the resistance offered by the components connected to the power source in a circuit, such as resistors, bulbs, or any load. It determines how much of the source's voltage is available to perform work, as the total resistance in the circuit is the sum of both internal and external resistances.

Series Circuit Analysis

Series circuit analysis involves understanding how voltage and current behave when components are connected end-to-end in a single loop. In a series circuit, the total voltage is the sum of individual voltage contributions, and the total resistance is the sum of individual resistances, which directly affects the current flowing through the circuit.

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