Question

equivalent resistance of R2 and R3

R23 = 4 * 4 / ( 4 + 4) = 2 ohm

effective potential difference

V = 15 + 20 - 25 = 10 V

voltage drop across R1

v1 = V * R1 / ( R1 + R2) = 10* 2 / ( 2 +2) = 5 V

power dissipated at R1

P1 = V1^2 / R1 = 12.5 W

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