Three resistors connected in parallel each carry currents labeled I1, I2, and I3 . Which of the following expresses the value of the total current IT in the combined system?
a. IT = (1/I1 + 1/I2 + 1/I3)
c. IT = I1 + I2 + I3
b. IT = I1 = I2 = I3
d. IT = (1/I1 + 1/I2 + 1/I3)-1
C
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