2.A] A load resistance π πΏβ¦ is connected across the source ππ with internal resistance π πππ‘ in series with source; obtain the condition that the power transferred to load from source is maximum.
Answer:-
The original two-terminal circuit is replaced with a Theveninβs equivalent circuit across the variable load resistance. The current through the load for any value of load resistance is
From the above expression, the power delivered depends on the values of RTH and RL, but
mainly on the load resistance RL (as RTH is constant). To find the exact value of RL, we apply
differentiation to PL with respect to RL and equating it to zero as shown below:
