Op Amp Power Accounting

An inverting amplifier circuit is constructed using a single 1-volt DC battery, three \(1\Omega\) resistors, and one operational amplifier (op amp), as shown above.

This particular op amp is ideal, which means that it has the following properties:

  • The voltages at the \((+)\) and \((-)\) terminals are identical.
  • The currents (into/out of) the \((+)\) and \((-)\) terminals are zero.

Given as a percentage, to one decimal place, how much of the total power consumed by the three resistors is supplied by the 1-volt battery?

Bonus: Where does the rest of the power come from? Why is it called an inverting amplifier?


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