12 cells each of emf 2v and of internal resistance
0.5ohm are arranged in a battery of n rows
and an enternal resistance 0.4ohm is connected
to the pole of the battery. estimate the current
flowing through the resistance in terms of m

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)