First slide

Phasors and Phasor Diagrams

Question

The power factor of a good choke coil is

Easy

A

Nearly zero
B

Exactly zero
C

Nearly one
D

Exactly one

Solution

$cosϕ = \frac{R}{Z} . In choke coil resistance is very small, so ϕ \approx 90^{\circ}, therefore cosϕ \approx 0$

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