a) The flow direction of current I4, I2 and Iz were picked arbitrarily in a circuit. Applying Kirchhoff's current law to point A and B in the circuit yield. 4 + 12 + I3 = 7 4 – 12 + 213 = 9 211 + I2 –...

Extracted text: a) The flow direction of current I4, I2 and Iz were picked arbitrarily in a circuit. Applying Kirchhoff's current law to point A and B in the circuit yield. 4 + 12 + I3 = 7 4 – 12 + 213 = 9 211 + I2 – 13 = 1 Find the unknown current l1, I2 and Iz by solving the above system of linear equations by using Gauss elimination method.