If the distance between the coils is large, the k is very small and approaches zero. If the two coils are tightly wound one on top of the other coil over a common ferromagnetic core, they are called perfectly coupled coils and the value of k approaches 1.
The coupling coefficient depends on the closeness of the coils, their core, their mutual orientation, and their winding. The coupling coefficient is defined as the ratio of the mutual inductance between the two coils to the maximum possible value of their mutual inductance. Where k is the coupling coefficient or coupling factor, L₁ is the inductance of the first coil and L₂ is the inductance of the second coil. The calculator will determine the mutual inductance M of two coupled inductors according to the following formula: The meter measures the voltage on the clamp coil and provides reading in the units of electric current The electromotive force induced in the clamp coil is proportional to the current flowing in the conductor sensed by the secondary coil.
The conductor with the current being measured acts as a primary coil of the transformer and the clamp coil is the secondary coil. The clamp of the meter contains a magnetic core and a coil wound around it. The meter works on the principle of mutual inductance. A clamp (or tong) meter with a split core uses an instrument transformer to safely measure current levels without the necessity to connect the meter to the electrical circuit.
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