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Finite Output Resistance is the measure of the opposition to current flow, both static and dynamic, into the load network being connected that is internal to the electrical source. It represents how much the output voltage changes with variations in output current.
The calculator uses the formula:
Where:
Explanation: This formula calculates the output resistance by measuring how much the output voltage changes in response to a change in output current.
Details: Finite output resistance is crucial in amplifier design as it affects voltage regulation, load matching, and overall circuit performance. A lower output resistance generally indicates better voltage regulation and ability to drive heavier loads.
Tips: Enter the change in output voltage in volts and the change in current in amperes. Both values must be positive and greater than zero for accurate calculation.
Q1: Why is finite output resistance important in amplifier design?
A: It determines how well the amplifier can maintain a constant output voltage when driving different loads, affecting stability and performance.
Q2: What are typical values for finite output resistance?
A: Values vary widely depending on the amplifier design, but ideal amplifiers have very low output resistance (close to 0Ω).
Q3: How does finite output resistance affect circuit performance?
A: Higher output resistance can cause voltage drops under load, reduced power transfer efficiency, and signal degradation.
Q4: Can output resistance be zero in practical amplifiers?
A: No, all practical amplifiers have some finite output resistance, though op-amps and other high-performance amplifiers can have very low values.
Q5: How is finite output resistance measured experimentally?
A: By measuring the change in output voltage when a known load is applied and calculating the resistance using Ohm's law.