As shown in Figure Q5, four 20 resistors and four 42 resistors are placed in the sides of a cube circuit. A switch S is also placed at of the sides of the cube. The cube circuit is connected to a 20V DC voltage source E. Solve the following problems. (a) When the switch S is open, calculate the output power the DC voltage source. (b) When the switch S is closed, calculate the output power the DC voltage source. R1-20 R5=492 R2=292 R3=292 WWW R6=49 M R7=492 www W R4-202 R8-40 Figure Q5 S E=20V

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