A-LevelPhysicsD.C. circuits9702/12 · May/June 2021 · Q371 Mark
A cell of electromotive force (e.m.f.) E and negligible internal resistance is connected to a circuit. The circuit has currents I₁, I₂ and I₃, and potential differences V₁, V₂ and V₃, as shown. [Figure 37.1] Which equation represents a statement of Kirchhoff's first law?
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AI₁ = I₂ + I₃
BI₁ = I₂ = I₃
CE = V₁ + V₂
DV₁ = V₂ = V₃
✓ Correct answer
A: I₁ = I₂ + I₃
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