(a) Refer to the circuit shown in Figure 4.1. (i) Calculate its Thevenin resistance and voltage external to the load resistor  RL. (ii) Sketch the Thevenin equivalent circuit. (iii) Determine the value of RL for maximum power transfer, and calculate the  maximum power delivered to the load RL.

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Thevenin Theorem

Any linear circuit, no matter how complex, maybe simplified to an equivalent circuit utilizing only a single voltage source and series resistance coupled to a load, according to Thevenin's Theorem. The superposition principle says that all foundational equations must be linear, and the notion of "linear" is still the same (i.e., there should not be any exponentials or roots). This is particularly the case when operating with passive elements like resistors, inductors, and capacitors. However, some components (particularly some gaseous and semiconductor devices like tunnel diode, Schottky diode, transistors like BJT, MOSFET) are nonlinear, meaning their current resistance fluctuates with voltage and current. As a result, circuits made up of these parts are known as nonlinear circuits.