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T1 = 127 C = 400 K
T2 = 47 C = 320 K
ditanya : efisiensi ?
jawab:
efisiensi = 1 - T2 x 100%
T1
= 1 - 320 x 100%
400
= 1 - 0,8 x 100%
= 0,2 x 100%
= 20%