Op amp circuit simulation problem

hepen2017

Op amp circuit simulation problem [Copy link]

Is there something wrong with the voltage and current in this simulation?

maychang

The resistor in the box has a voltage of 1V across its two ends, a resistance of 100Ω, but a current of 10.5mA. According to Ohm's law, do you think there is any problem?

bioger

If you know why the op amp output is 26.8, you will know why the other one is 10.5.

gmchen

I don't know what simulation software this is, but it's obviously an incorrect result

hepen2017

Substituting into the formula, the output voltage is correct

gmchen

hepen2017 Published on 2018-1-14 23:45 Substituting into the formula, the output voltage is correct

Directly using the circuit formula to calculate, it can indeed get the output voltage is 16.3V, but at the same time, it can also get the voltage of the two input terminals of the op amp is 11.05V. It is this tiny 50mV error that makes the simulation result appear to be inconsistent with Ohm's law

Xjhkai

Understand the operation. The 20V at the virtual short same-direction input end is divided by two resistors to get 11.05V. The virtual short reverse input is also 11.05V. The voltage difference between the two ends of the reverse input end is 1.05V. The resistor is 100 ohms and the current at the reverse input end is 10.05ma. There is no problem.