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R1+R2 with dimmers in circuit.

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Simonslimline

Simonslimline

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What is the reason that a dimmer makes R1+R2 readings so high when still connected in lighting circuits?

I may be missing the obvious but is it anything to do with Back EMF?
 
because you are reading the dimmer as well as the circuit. it doesn't give you a clean on/off like a switch.
 

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