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yubson
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In measuring the internal resistance of a power supply, why is a resistor with low resistance used?
Who says that it is? You need to be more specific in your question. I think you have misunderstood something.yubson said:In measuring the internal resistance of a power supply, why is a resistor with low resistance used?
Are you talking about an ammeter? Could you be more clear?yubson said:In measuring the internal resistance of a power supply, why is a resistor with low resistance used?
yubson said:In measuring the internal resistance of a power supply, why is a resistor with low resistance used?
lekh2003 said:Are you talking about an ammeter? Could you be more clear?
- Internal resistance
A practical electrical power source which is a linear electric circuit may, according to Thévenin's theorem, be represented as an ideal voltage source in series with an impedance. This impedance is termed the internal resistance of the source. When the power source delivers current, the measured voltage output is lower than the no-load voltage; the difference is the voltage drop caused by the internal resistance. The concept of internal resistance applies to all kinds of electrical sources and is useful for analyzing many types of electrical circuits.
I think you are just asking why they use a low resistance load on the power supply. The reason is that the voltage drop with a high current is greater and easy to measure. If you know the Voltage lost (open circuit volts minus test volts) and the current being supplied, it will tell you the value of the Series Resistance that's in the box.yubson said:In measuring the internal resistance of a power supply, why is a resistor with low resistance used?
Some power supplies have virtually no internal impedance within their design operating range. The voltage stays the same no matter the output current.davenn said:I never really hear anyone talking about the internal resistance of a non-battery PSU ... I would assume it would also have one
For the regulation to be stable, a PSU would need a finite internal resistance, I think but that could be very low.David Lewis said:Some power supplies have virtually no internal impedance within their design operating range. The voltage stays the same no matter the output current.
David Lewis said:Some power supplies have virtually no internal impedance within their design operating range. The voltage stays the same no matter the output current.
The internal resistance of a power supply can be measured by using a multimeter. Set the multimeter to measure resistance (ohms) and connect the positive lead to the positive terminal of the power supply and the negative lead to the negative terminal. The reading on the multimeter will give you the internal resistance of the power supply.
Measuring the internal resistance of a power supply is important because it can affect the performance and efficiency of the power supply. A higher internal resistance can result in a voltage drop, which can lead to a decrease in the output voltage and power of the supply.
The typical range of internal resistance for power supplies is between 0.1 ohms to 1 ohm. However, it can vary depending on the type and quality of the power supply.
The internal resistance of a power supply can affect its stability by causing fluctuations in the output voltage. A higher internal resistance can result in a less stable output, which can lead to issues with the devices connected to the power supply.
Yes, the internal resistance of a power supply can be reduced by using thicker wires and larger components that can handle higher currents. Additionally, keeping the power supply cool and using high-quality components can also help reduce the internal resistance.