# Some of the exercises show op-amps with a positive supply voltage but no information about negative supply voltages. Whenever this is encountered, assume the negative supply voltage has the same magnitude as that of the positive supply

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Some of the exercises show op-amps with a positive supply voltage but no information about negative supply voltages. Whenever this is encountered, assume the negative supply voltage has the same magnitude as that of the positive supply
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Step 1

Mark the current and node voltages in given circuit as shown below:

Step 2

For ideal-op-amp, the current in inverting and non-inverting terminal are zero, due to the high input resistance of op-amp.

By virtual ground concept, the voltage at the inverting terminal should be equal to the non-inverting terminal.

Step 3

Applying the nodal analysis a... help_outlineImage Transcriptionclose1 1 1 2 0 0 1 0 0 R2 = 1 R R. R, 1+ .(1) fullscreen

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### Electrical Engineering 