Consider the circuit shown on the previous page that has a switch that is initially open. (When the switch is open, as shown, there is an open circuit at the location of switch. When the switch is closed, the wires to either side of the switch are connected together, providing a continuous path for current to flow. Thought of another way, the switch becomes a short circuit.) (a) [12] With the switch open, is the circuit a valid circuit? If not, explain why not. If so, provide the power associated with the 2 A current source and the 40 V voltage source. (Use negative for delivered power and positive for consumed power.) (b) [12] The switch is now closed. With the switch closed, is the circuit a valid circuit? If not, explain why not. If so, provide the power associated with the 2 A current source and the 40 V voltage source. (Use negative for delivered power and positive for con- sumed power.) 50 V 10 V + D 2 A + 40 V