Measurement and Instrumentation
The total current I = I1 + I2 in a circuit is measured as I1 = 150 ± 1A , I2 = 250 ± 2A, where the limits of error are as standard deviations. I is measured as

 (400 ± 2.24) A
 (400 ± 1) A
 (400 ± 1.5) A
 (400 ± 3) A

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Measurement and Instrumentation
It can be stated that

CT operates at almost the same flux density as a PT
No generalisation can be made with regard to the flux densities in CT and PT
CT operates with a higher flux density than PT
CT operates with considerably lower flux density than a PT

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