Class Activity (Week 4)

In this week, Thevenin's Theorem, and Norton's Theorem are investigated.

Thevenin's resistor and Norton's resistor is equal. Thevenin’s Theorem states, in any linear electric

circuit consisting of a combination of voltage or current sources and resistors can be replaced by a

single voltage source with the Thevenin voltage, Vth and a single internal resistance equal to the

Thevenin resistance, Rth.

Figure 1: Thevenin's Theorem

In order to find Rth, current sources must be open, and voltage sources must be short-circuit.

Figure 2: Norton's Theorem

In order to find I(Norton), Thevenin's voltage can be used, or the current passes through between a and b can be found.

The Superposition Method

When a linear system sources exist in a electrical circuit, superposition method can be used. In this

method all sources eliminate except voltage source one, and all of branch currents or branch voltages

are calculated. Then, all sources eliminate except voltage source two, and all of branch currents or

branch voltages are calculated. Finally, branch currents in each stage can be added to determine true

current value.

Figure 3: Superposition Method

Figure 4: Real voltage of circuit