We are hoping to create a lab for students at our university that requires them to measure the power factor and correct for it. We are working with 230V AC and have a maximum power of 300W. We were hoping to create a device that lets us adjust the power factor, but have run into quite a few problems. Our biggest issue is that we require extremely large inductors or resistors to make a significant effect on the power factor.

We were wondering if anyone had any good alternatives. We currently have a fan hooked up that results in a power factor of 0.6, but we were hoping to create something more compact.

Our current design is below, but does not have the correct inductors:


simulate this circuit – Schematic created using CircuitLab

  • 2
    \$\begingroup\$ Is it also a goal to teach the student to work safely with high voltages/live wires? If not, why not use a transformer and work with say 15VAC? It will scale down the size of those inductors and resistors. \$\endgroup\$ – Huisman Apr 4 at 6:27
  • \$\begingroup\$ Just teach them theory of RLC tuned circuits and resonance - it's 100% exactly the same as studying power factor correction but smaller components are used. \$\endgroup\$ – Andy aka Apr 4 at 7:18

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