The figure below shows a collection of wires. The currents at the numbered point

Question

The figure below shows a collection of wires. The currents at the numbered points are: I1 = 2.8 mA right; I2 = 3.9 mA down; I3 = 1.0 mA right; I4 = 4.5 mA up; and I5 = 1.1 mA up.

a. What is the current at point A (size and direction)?
____________________ mA ---

LEFT OR RIGHT OR N/A
b. What is the current at point B (size and direction)?
____________________mA ---

UP OR DOWN OR N/A

The figure below shows a collection of wires. The currents at the numbered points are: I1 = 2.8 mA right; I2 = 3.9 mA down; I3 = 1.0 mA right; I4 = 4.5 mA up; and I5 = 1.1 mA up. Junction Rule a. What is the current at point A (size and direction)? ____________________ mA --- LEFT OR RIGHT OR N/A b. What is the current at point B (size and direction)? ____________________mA --- UP OR DOWN OR N/A

Explanation / Answer

a)by KCL,

2.8+3.9=1.0+x

or Ia=5.7 mA(towards right)

b)by KCL,

2.8+3.9+4.5=Ib

or Ib=11.2 mA(upwards

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