Consider the circuit shown Calculate the voltage V1 using a
     Consider the circuit shown:  Calculate the voltage V_1 using a single node equation.  Find the current through the 20V supply.  Find the voltage of the 2A supply.  Is the 20V supply a power source, power sink, or neither? In other words, is the power negative, positive, or zero?   
  
  Solution
A negative feedback amplifier (or feedback amplifier) is an electronic amplifier that subtracts a fraction of its output from its input, so that negativefeedback opposes the original signa

