Current A, which is 12 amps, lags current B, which is 4 amps, by 45 degrees. Sketch two phasor diagrams of these currents. Reference the first on current A and the second on current B. For each of these two cases, find the phasor sum, or resultant , of these two currents and express it in both polar and rectangular notations.

Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 mpa and -10°c at a rate of 0.05 ka/s and leaves at 0.8 mpa and 50°c. the refrigerant is cooied in the condenser to 0.72 mpa and 26'c. it is then throttled to 0.15 mpa. sketch the t-s diagram for the system and evaluate: 6) the rate of heat removai from the refrigerated space (kw), it) the power input to the compressor (kw), ii) the isentropic efficiency of the compressor (%), and iv) the cop of the refrigerator.