Question: To determine current in 3 kohm resistor in the circuit shown in figure below with Rl= 6kohm According to the thevenin theorem the network is reduced to a source having the value of Eth and Rth as<img class="alignnone size-medium wp-image-6690" src="http://examradar.com/wp-content/uploads/2018/12/ckt-300x147.png" alt="ckt" width="300" height="147" />

Answer:

Thevenin’s Theorem states that “Any linear circuit containing several voltages and resistances can be replaced by just one single voltage in series with a single resistance connected across the load“. In other words, it is possible to simplify any electrical circuit, no matter how complex, to an equivalent two-terminal circuit with just a single constant voltage source in series with a resistance (or impedance) connected to a load