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If you have a light switch where you can brightener it or dim it that is a VARIABLE RESISTOR.
Yes, there is a device inside it to allow the unit to dim the lamp.
no you can't
An emergency light is connected by attaching one set of wires to the buildings wiring and another to a built in battery. When the light detects the power has been cut, it will automatically switch over to its battery and turn on.
#12 should be sufficient.