Electrical feedback

[Kebian]

Dear All,

Someone pls explain how feedback occurs in power circuits, not in sound or electronics.

For eg, you have a light circuit serving a few rooms. feed picked from one switch to the other. In a room, switch turned off, but testing at the lamp holder the tester light is dimly on. how and why?

Would also appreciate other examples

Thanks

[luis4170]

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[user82]

If you have two circuits side by side (in trunking/conduit) and one circuit is powered on and other circuit is powered off. The circuit that is powered off will pick up a small voltage due to the capacitance between it and the circuit that is powered on.

So even though circuit is powered off it will still see a voltage.

Google "Ghost Voltage" , "Stray Voltage"

[user82]

If you have two circuits side by side (in trunking/conduit) and one circuit is powered on and other circuit is powered off. The circuit that is powered off will pick up a small voltage due to the capacitance between it and the circuit that is powered on.

So even though circuit is powered off it will still see a voltage.

Google "Ghost Voltage" , "Stray Voltage"