In the circuit shown, the current sources are of negligible...

In the circuit shown, the current sources are of negligible internal resistances. What is the potential difference between the points $\mathrm{B}$ and $\mathrm{A}$ ?
(A) $-4.0 \mathrm{~V}$
(B) $4.0 \mathrm{~V}$
(C) $-8.0 \mathrm{~V}$
(D) $8.0 \mathrm{~V}$

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Key Concepts

Ideal Current Source

An ideal current source delivers a constant current regardless of the voltage across it, assuming zero internal resistance. This assumption simplifies circuit analysis because it means that the behavior of the source is independent of any connected load, allowing for straightforward application of circuit laws.

Potential Difference

Potential difference, or voltage, is the measure of electrical energy difference per unit charge between two points in a circuit. It is fundamental for understanding how energy is transferred and converted in circuits and is determined by both the properties of the sources and the circuit elements.

Kirchhoff's Circuit Laws

Kirchhoff’s laws, including the current law (KCL) and the voltage law (KVL), are essential for circuit analysis. KCL ensures that the sum of currents at any junction equals zero, while KVL states that the sum of voltage drops around any closed loop in a circuit must be zero. These laws are used to analyze the distribution of current and voltage in a network.

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