Page 16 - Basics of Electrical, Electronic and Communication

12 Chapter 1. Basic Concepts in Electrical Engineering

3 Ω
5 Ω
6 Ω

35 V

1 1 1 3
Then = + =
R P 3 6 6
Therefore, R P = 2 Ω
Total resistance in the circuit, R = R P + 5 = 2 + 5 = 7 Ω

V 35
Supply current, I = = = 5 A
R 7

Example 2
Find the total resistance of the circuit across the terminals X and Y.
Also find the power consumed by the circuit if a 12 V battery is con-
nected across XY.

4 Ω
4 Ω
2 Ω 4 Ω
2 Ω 4 Ω
X Z Y
4 Ω
4 Ω
12 V

Solution

2 × 2
R XZ = = 1 Ω
2 + 2
1 1 1 1 1 4
= + + + = = 1Ω
R ZY 4 4 4 4 4

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