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### Internal resistance of LDo

I was trying to measure the internal resistance of an LDO that will produce 2.85V. I used a Digital multimeter to do this, but I got a resistance of 810 Ohm and the LDO can support upto 450 mA. Will the internal resistance of the LDO can be that high?...Read more

### Finding the Internal Resistance of an Ammeter using a shunt

There is this lab procedure to determine the internal resistance of an ammeter which differs from the usual process. In this new procedure, we connect a voltage supply in series with a resistor of some known value and an analog ammeter (top image). We increase the voltage until the ammeter reads 30mA and then turn off the supply. Then we add a shunt (a wire) in parallel to the ammeter (bottom image). We now use this setup and determine the internal resistance through some calculations using the formula shown in the image. I am not sure why...Read more

### Hexagonal resistor circuit (equivalent resistance )

I've already find the equivalent resistance between A en B by Star-Triangle transformation , but can someone just explain how can i handle it by Symmetry,asymmetry network analysis ? all the resistor are considered to have the same resistance! Thank you !...Read more