1. Transistors act basically as voltage sources.
2. Find RN for the circuit given.

3. What is the Thevenin equivalent (VTH and RTH) for the circuit given?

4. Determine $${I_{\text{N}}}$$ for the circuit consisting of VS, R1, R2 and R3 shown in the given circuit.

5. Find the total current through R3 in the given circuit.
