A: There are an awful lot of IC family that uses 5 volts buss. TTL RTL DTL including microprocessors
The output of a 120 volt dimmer switch will be an AC voltage so should not be used on a DC motor.
motor connection to inverter
With an appropriately rated DC to DC converter.
Depends on the source. If your source is two 12v batteries in series you attach to the terminals of one battery only. Otherwise, you must drop the voltage by adding resistance to the circuit.
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can ou step down 36 volts dc to 12 volt dc using batteries
No. The value and polarity are different.
With an invertor/rectifier or voltage multiplier.
Use a properly rated potentiometer.
120 volt single phase rectifies to about 96 volt DC
An automobile cigarette lighter uses 12 Volts DC. A typical 120 Volt circuit would destroy the 12 volt lighter.
Frequency is independent of voltage magnitude. It depends upon type AC or DC.