Circuits

1. ELECTRONICS
Fall 2020
Lec. 9
Dr. Mona M.Soliman
Dr. Walid M. Ibrahim
IT Dept.

2. 2
Thévenin Eq. Circuit
 Principle
 Thevenin equivalent circuit.
≡
network
of
sources
and
resistors
RL
iL
+
vL
–
a
b
–
+
VTh
RTh
RL
iL
+
vL
–
a
b
Thévenin equivalent circuit

3. 3
Norton Eq. Circuit
 Principle
 Norton equivalent circuit.
≡
network
of
sources
and
resistors
RL
iL
+
vL
–
a
b
Norton equivalent circuit
a
RL
iL
+
vL
–
iN
b
RN

4. 4
Norton Eq. Circuit
 Procedure
 𝑽𝑻𝒉 = 𝑽𝒐𝒄
 𝑹𝑻𝒉 = 𝑹𝒆𝒒 =
𝑽𝑻𝒉
𝑰𝒔𝒄
 𝑰𝑵 = 𝑰𝒔𝒄 =
𝑽𝑻𝒉
𝑹𝑻𝒉
network
of
sources
A
nd
resistors
a
b
+
voc
–
network
of
sources
and
resistors
a
b
isc

5. Norton Eq. Circuit
(Example-4)
Find Norton eq. Circuit:

6. 6

7. 7

8. 8
Find Thevenin eq. Circuit with respect to 3k
Resistor
Norton Eq. Circuit
(Example-5)

9. 9

10. 10

11. Example-4
 Find Rth for the following circuit w.r.t
terminal a-b
11