If all four input resistors to a summing amplifier are 2.2 k and ...

[j.rubin]

If all four input resistors to a summing amplifier are 2.2 k and the feedback resistor is 2.2 k, then the gain equals ________.
 
  A) 1 B) 4 C) 2.2 D) unknown

Question 2

If all four input resistors to a summing amplifier are 2.2 k, the feedback resistor is 2.2 k and all four input voltages are -2 V, the output voltage equals ________.
 
  A) 10 V B) 8 V C) 2.2 V D) 2 V

[tdewitt]

Answer to Question 1

A

Answer to Question 2

B

[j.rubin]

Great answer, keep it coming

[coreycathey]

Thanks for the timely response, appreciate it