Newnes Circuit Calculations Pocket Book

58

Circuit calculations pocket book

k

1.428 A

2.856 V

2a *v

4ft

4

V

1.286 A

0.142 A ,

8ft

5.144 V

1.144 V

Figure

4.11

4.2

Superposition theorem

If a network of linear resistors contains more than one source of

e.m.f.,

the current flowing at any point is the algebraic sum of the

currents that would flow at that point, if each source was considered

separately, with all other sources replaced at that time by

resistances equal to their internal resistances.

Example 6 Find the currents in each branch of the circuit in Figure

4.12 using the superposition theorem. This circuit is identical to

Figure 4.6.

Figure

4.12

First remove the 2-V source an