الفيزياء العامة الجزء الثاني#موقع الفيزياء.كوم

Lectures in General Physics
Example 7.6
Find the equivalent resistance for the circuit shown in figure 7.6.
R 1 =3Ω, R 2 =6Ω, and R 3 =4Ω.
R 2
R 3
R 1
Figure 7.6
Solution
Resistance R 1 and R 2 are connected in parallel therefore the circuit is
simplify as shown below
R 3
R 1
&R 2
R
1
=
R′
1
=
R′
1 1
+
R R
1
3
1
+
R′ = 2Ω
1
6
2
=
3
6
Then the resultant resistance of R 1 &R 2 (R′ ) are connected in series with
resistance R 3
R= R′ +R 3 =2+4=6Ω
Example 7.7
Find the equivalent resistance for the circuit shown in figure 7.7.
R 1 =4Ω, R 2 =3Ω, R 3 =3Ω, R 4 =5Ω, and R 5 =2.9Ω.
Dr. Hazem Falah Sakeek