basic electrical

4. What is the value of the unknown resistor R in Fig. 1.16 if the voltage drop across
the 500 ohm resistor is 2.5 volts ? All resistances are in ohm.

5. Q. Calculate the effective resistance of the following combination of resistances and the voltage drop
across each resistance when a P.D. of 60 V is applied between points A and B.

10. It may be noted that if a voltmeter is connected across the open bulb, it will read full supply
voltage of 220 V.

13. Q. A resistance of 10 ohm is connected in series with two resistances each
of 15 ohm arranged in parallel. What resistance must be shunted across this
parallel combination so that the total current taken shall be 1.5 A with 20 V
applied ?

15. Find the equivalent resistance of the circuit given in Fig. between the following points (i) A and B (ii) C
and D (iii) E and F (iv) A and F and (v) A and C. Numbers represent resistances in ohm.

16. Using the current-divider rule, find the ratio IL/IS in the circuit shown in Fig.

17. An ohmeter is used for measuring the resistance of a circuit between its two terminals. What would be
the reading of such an instrument used for the circuit of Fig. below at point (a) AB (b) AC and (c) BC ?
All resistances are in ohm.

18. Find the current and power supplied by the battery to the circuit of Fig. (i) under normal conditions
and (ii) when a ‘short’ occurs across terminals A and B. All resistances are in kilo-ohm.

19. Prove that the output voltage V0 in the circuit of Fig. is
V/13.

20. DC Sources

24. Using Kirchhoff’s Current Law and Ohm’s Law, find the magnitude and polarity of
voltage V in Fig. Directions of the two current sources are as shown.

25. Find VCE AND VAG
VCE = (- 5 × 2) + (10) - (5 × 1) = - 5V
The negative sign shows that point C is negative with respect to
point E.
VAG = (7 × 2) + (10) + (6 × 1) = 30 V.
The positive sign shows that point A is at a positive
potential of 30 V with respect to point G.

26. Maxwell’s Loop Current Method (Mesh Analysis)

27. Solve using mesh analysis and find I3
I3= 0.823 A

28. Determine the current supplied by each battery in the circuit shown

29. Q. Find the current through the 3 ohm resistance connected between C and D Fig

30. Nodal Analysis

33. Q. Using Node voltage method, find the current in the 3 ohm resistance for the network
shown in Fig

34. Find the branch currents in the circuit of Fig. by
using (i) nodal analysis and (ii) loop analysis.

36. Nodal Analysis with current sources

37. Use nodal analysis method to find currents in the various
resistors of the circuit shown in Fig.

38. Source Transformation