Everything Science Grade 11

19.4 CHAPTER 19. ELECTRIC CIRCUITS

We can similarly calculate the total resistance of Parallel Circuit 2:

1

Rp 2

=

1

R 5

+

1

R 6

+

1

R 7

Rp 2 =

�

1

10

+

1

10

+

1

10

�− 1

=

�

1 + 1 + 1

10

�− 1

=

�

3

10

�− 1

= 3,33Ω

Rp 1 =^103 Ω

R 4 = 10Ω

Rp 2 =^103 Ω

This has now being simplified to a simple seriescircuit and the equivalent resistance is:

R = Rp 1 + R 4 + Rp 2

=

10

3

+ 10 +

10

3

=

100 + 30 + 100

30

=

230

30

= 7,66Ω

The equivalent resistance of the circuit in Figure19.1 is 7,66Ω.

Exercise 19 - 3

Determine the equivalent resistance of the following circuits:

1.

2 Ω

2 Ω

4 Ω