P 6.3-4 Find v and i for the circuit of Figure P 6.3-4.

 

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Figure P 6.3-4

 

By the first rule of ideal op-amps, the two inputs must have the same voltage, so v across the current source must be 5 V.

 

By the second rule of ideal op-amps, the inputs carry no current, so the 10 k resistor must drop 1 V across it.  Therefore we can find the voltage across the 20 k resistor from a voltage walk.

 

So the current i can be found by Ohm’s law

 

 

 

 

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This page last updated on March 12, 2019