[amp_mcq option1=”Zero internal resistance” option2=”Infinite internal resistance” option3=”A small internal resistance” option4=”A large internal resistance E. None of the above” correct=”option1″]
The correct answer is: A real voltage source has a small internal resistance.
A real voltage source is a device that maintains a constant voltage across its terminals regardless of the current that is drawn from it. However, no real voltage source can be perfect, and there will always be some resistance associated with the source. This resistance is called the internal resistance of the source.
The internal resistance of a voltage source can be thought of as a resistor that is connected in series with the ideal voltage source. The internal resistance causes a voltage drop across the source, which reduces the voltage that is available to the load.
The internal resistance of a voltage source is typically very small, but it can have a significant impact on the performance of the circuit. For example, if the internal resistance of a voltage source is 1 ohm, and the load resistance is 10 ohms, then the voltage drop across the internal resistance will be 1 volt. This means that the voltage that is available to the load will only be 9 volts.
The internal resistance of a voltage source can be reduced by using a higher quality source, or by using a lower resistance load. However, it is impossible to eliminate the internal resistance completely.
Option A: Zero internal resistance is not possible for a real voltage source. If the internal resistance were zero, then there would be no voltage drop across the source, and the full voltage of the source would be available to the load. This would violate the law of conservation of energy, which states that energy can neither be created nor destroyed.
Option B: Infinite internal resistance is also not possible for a real voltage source. If the internal resistance were infinite, then there would be a voltage drop across the source, but no current would flow. This would mean that the source would not be able to deliver any power to the load.
Option C: A small internal resistance is the most realistic option for a real voltage source. As mentioned above, the internal resistance of a real voltage source is typically very small, but it can have a significant impact on the performance of the circuit.
Option D: A large internal resistance is not a realistic option for a real voltage source. As mentioned above, the internal resistance of a real voltage source is typically very small. If the internal resistance were large, then the source would not be able to deliver any power to the load.
Option E: None of the above is not the correct answer. The correct answer is that a real voltage source has a small internal resistance.