Node inflow by KCL: In a three-branch parallel circuit, currents of 200 mA, 340 mA, and 700 mA are measured in the same direction into a junction. What is the current into the junction?

Introduction / Context:
Kirchhoff’s Current Law (KCL) also applies when multiple branch currents converge into a node. The total current into the node is the sum of all branch currents directed into that node at that instant.

Given Data / Assumptions:

• Three measured currents entering the node: 200 mA, 340 mA, 700 mA.
• All measurements are referenced with the same sign convention (into the node).
• Steady-state analysis.

Concept / Approach:

Add currents that share the same direction into the node to find the total inflow. This is a direct application of current conservation.

Step-by-Step Solution:

Verification / Alternative check:

If the node had only 900 mA entering, the missing 340 mA would violate KCL unless there were an unaccounted source/sink, which the problem does not imply.

Why Other Options Are Wrong:

900 mA and 540 mA are partial sums. 200 mA is just one branch. 0 A contradicts the measurements.

Common Pitfalls:

Forgetting unit conversion mA to A, or accidentally subtracting when all currents share the same direction.

Final Answer:

1.24 A