Kirchhoff's Junction Rule Video Lessons

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Problem: Consider the juncion of three wires as shown in the diagram. (Figure 1)The magnitudes of the current density and the diameters for wires 1 and 2 are given in the table. The current directions are indicated by the arrows.WireCurrent density(A/mm2)Diameter(mm)13.11.624.92.8Find the current I3 in wire 3.Express your answer in amperes to two significant figures. Call current out of the junction positive and current into the junction negative.

FREE Expert Solution

Kirchhoff's junction rule:

ΣIin=ΣIout

I1 + I3 = I2

Current density, J = I/A

I = JA

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Problem Details

Consider the juncion of three wires as shown in the diagram. (Figure 1)

no title provided

The magnitudes of the current density and the diameters for wires 1 and 2 are given in the table. The current directions are indicated by the arrows.


WireCurrent density
(A/mm2)
Diameter
(mm)
13.11.6
24.92.8


Find the current I3 in wire 3.

Express your answer in amperes to two significant figures. Call current out of the junction positive and current into the junction negative.

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