alleryKirchhoff's junction rule for currents I1, I2 into a junction gives:
AI3 = I1 - I2
BI3 = I1 x I2
CI3 = I1 / I2
DI3 = I1 + I2
Answer & Solution
Correct answer: D. I3 = I1 + I2
1. Charge cannot pile up at a junction.
2. So what flows in must flow out.
3. The junction rule says I3 equals I1 plus I2.
4. The answer is I3 = I1 + I2.
_Source: syllabus Physics, Ch 3 'Current Electricity'_
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