Tutorial – 1:DC Circuit Analysis

ELE 101 / 102 Dept of E & E Engg, MIT Manipal 2

[1] The resistance of a coil of wire increases from 50 at 15° C to 58 at

55° C. Calculate the temperature coefficient of resistance at 0° C

Ans: 0.004255 °C-1

Exercises

ELE 101 / 102 Dept of E & E Engg, MIT Manipal 3

Exercise

[2] An Aluminium wire of 7.5 m long is connected in parallel with a

copper wire of 6 m long. When a current of 5 A is passed through the

combination, it is found that the current in the Aluminium wire is 3 A.

The diameter of the Aluminium wire is 1 mm. Determine the diameter

of the copper wire. Resistivity of copper is 0.017 m; that of

Aluminium is 0.028 m

[0.569 mm]

ELE 101 / 102 Dept of E & E Engg, MIT Manipal 4

1 8 0 V

8

4

1 2 1 0

1 2

3 4

3 0

1 3

1 7

3 0

F ig 1

Exercises

[3] For the circuit shown in Fig 1, using network reduction techniques,

determine the current through the 10 resistor

Ans: 6 A

ELE 101 / 102 Dept of E & E Engg, MIT Manipal 5

Exercise

[4] Using source transformation technique, reduce the circuit below to a single voltage source and resistance across AB.

[10.636V, 2.18Ω]

+ -

+- +-

2A

6V3

1 0V2

4V6

9A

0 . 5A

A B

ELE 101 / 102 Dept of E & E Engg, MIT Manipal 6

Exercise

[5] Using source transformation, determine the value of current source I if the power dissipated by the 5 Ω resistor is 15W.

[1.8 A]