What happens if you force a different voltages into opamp?

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SUMMARY

When different voltages are applied to the terminals of an operational amplifier (op-amp), the output will saturate at either the positive or negative supply voltage, depending on which input is more positive. Specifically, if a 5V source is connected to one terminal and a 2V source to the other, the op-amp output will hit the rail at +VCC. This behavior occurs unless negative feedback is properly configured, which typically involves connecting the output (VOUT) to the inverting terminal (V-) through a resistor.

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The professors have taught you that in an opamp, the voltage in one terminal is equal to another.

Suppose you put a 5V voltage source in one terminal and 2V voltage source in the other. What happens then?
 
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Operational amplifiers are differential. i.e. they are based on the voltage difference of the inputs.

Check out these collection of circuits to see how the inputs are used.
 
l46kok said:
The professors have taught you that in an opamp, the voltage in one terminal is equal to another.

only if there is negative feedback (correctly wired up from VOUT to the V- terminal usually through some resistance).

Suppose you put a 5V voltage source in one terminal and 2V voltage source in the other. What happens then?

the op-amp output is saturated (hits the rail) at either +VCC or -VCC (depending on which of the V+ or V- inputs gets connected to the more positive voltage).
 

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