Question
Download Solution PDFA DC source of EMF E volts and internal resistance R ohms is connected to a variable load and it is adjusted such that the load absorbs maximum power from the source. The current drawn from the source is:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFMaximum Power Transfer Theorem
The maximum power transfer theorem states that the maximum power is delivered to a load when the load resistance is equal to the source resistance.
The maximum power across the load is given by:
\(P_{max}={V_{th}^2\over 4R_{th}}\)
Calculation
When maximum power is flowing from source to load, the voltage across the load is half of the Thevenin voltage.
Consider Thevenin voltage (Vth) = E
The voltage across the load, \(V_L={E\over 2}\)
The current drawn from the source is given by:
\(I={E- {E\over 2}\over R}\)
\(I=\rm \frac{E}{2R}\)
Last updated on May 29, 2025
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