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							         UNIVERSITY OF MASSACHUSETTS DARTMOUTH
          DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING

                                     ECE 201

                                CIRCUIT THEORY I

                            CLASSROOM PROBLEM #1



•   The voltage across the 22.5 Ω resistor is 90 Volts as shown.




                                                               +
                                     R1                                  R2
                                     4 Ohm                     90V       22.5 Ohm

                                                               -



          Vsource                                  R5
          240 V
                                                5 Ohm




                                     R3                                  R4
                                     20 Ohm                              15 Ohm




•   a)      Find the power dissipated in each resistor.

•   b)      Find the power supplied by the 240 V ideal voltage source.

•   c)      Verify that the power supplied equals the power dissipated.