Use of Thevenin’s Theorem With Example Step By Step
A French engineer; M.L. Thevenin made Thevenin’s theorem. V TH - Thevenin voltage is defined as the voltage across the load terminal when the load resistor is open. The Thevenin voltage is sometimes called the open circuit voltage. R TH – Thevenin resistors is defined as the resistance that an ohmmeter measures across the load terminal when all source are reduced to zero and the load resistor is open. To reduce the load resistor, if; Voltage source – close circuit Current source – open circuit Replace the circuit using above guideline. Ex 1: Find V TH , R TH , I L and V L using above circuit. Step 1: Remove R L resistor There isn’t any current across 8kΩ resistor So, we can divide voltage between 12kΩ and 4kΩ resistors V (4kΩ) = (48/ (12+4))*4 V (12kΩ) = (48/ (12+4))*12 12V 36V