Question

in an electric circuit the current 2A , 1.5A and 3A flow towards the junction while a current of magnitude is 2.5A and an unknown current leave the junction find the magnitude of unknown current ​

Answer 1

Explanation:

Given: I1 = 2A I2 = 1.5 A I3 = 3A I4 = - 2.5 A Opposite direction To find: Unknown current x Formula: ∑I = 0 Calculation: Let the unknown current be x. From formula Kirchoff’s 1st law I1 + I2 + I3 + I4 + -x = 0 Negative sign indicates that current leaves the junction ∴ 2 + 1.5 + 3 + -2.5 - x = 0 ∴ 4 - x = 0 ∴ x = 4A