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Class 12 Physics (India)

Lesson 8: Kirchhoff's loop rule

Kirchhoff's loop rule: Symbolic problems

Three resistors with different resistances are connected to a battery with voltage delta, start text, V, end text as seen below.

Which of the following equations correctly represent the total potential difference for a complete loop in the circuit diagram above?

(Choice A)
delta, start text, V, end text, minus, I, start subscript, 1, end subscript, R, start subscript, 1, end subscript, minus, I, start subscript, 3, end subscript, R, start subscript, 3, end subscript, equals, 0
(Choice B)
delta, start text, V, end text, minus, I, start subscript, 1, end subscript, R, start subscript, 1, end subscript, minus, I, start subscript, 2, end subscript, R, start subscript, 2, end subscript, minus, I, start subscript, 3, end subscript, R, start subscript, 3, end subscript, equals, 0
(Choice C)
delta, start text, V, end text, minus, I, start subscript, 1, end subscript, R, start subscript, 1, end subscript, minus, I, start subscript, 2, end subscript, R, start subscript, 2, end subscript, equals, 0
(Choice D)
minus, I, start subscript, 1, end subscript, R, start subscript, 1, end subscript, minus, I, start subscript, 2, end subscript, R, start subscript, 2, end subscript, minus, I, start subscript, 3, end subscript, R, start subscript, 3, end subscript, equals, 0

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