Non-zero voltage on tranformer secondary with circuit to primary being open

[giosif]

Hi,

Sorry for the newbie/basic/naive question, but could someone please tell me how it is possible to see approx 16 Vac on a transformer secondary (relative to the Earth ground), all this while the circuit from the mains to the primary is open (both Live and Neutral lines are controlled by a DPST switch)?

[Later edit] I should add that the mentioned voltage is present only when the (open) circuit to the primary is connected to the mains.

Thank you!

Best regards,
George

[JohnnyBerg]

Hi George,

Stray capacitance between primary and secondary?

Put a 1K resistor in parallel with your meter, and test again.

[giosif]

Hi George,

Stray capacitance between primary and secondary?

Put a 1K resistor in parallel with your meter, and test again.

Hi,

You are right: no voltage with a 1K resistor in parallel with the meter.
Any pointers where I could read more about this behaviour?

Thanks!

Regards,
George