Find the currents flowing in the circuit in the figure below. (Assume the resistances are R1 = 6 Ω, R2 = 20 Ω, R3 = 12 Ω, R4 = 8 Ω, r1 = 0.5 Ω, r2 = 0.75 Ω, r3 = 0.25 Ω, and r4 = 0.75 Ω.)

Arefrigerator uses r-134a as the working fluid and operates on the ideal vapor-compression refrigeration cycle except for the compression process. the refrigerant enters the evaporator at 120 kpa with a quality of 34 percent and leaves the compressor at 70°c. if the compressor consumes 450 w of power, determine (a) the mass flow rate of the refrigerant, (b) the condenser pressure, and (c) the cop of the refrigerator. (0.00644 kg/s, 800 kpa, 2.03)