A: Milli kilo represent a multiplier 900 mv is equivalent to 0.9 volts or 0.0009 kilo volts the value remain the same just the decimal move 3 places
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Voltage most certainly can be expressed in millivolts. Milli is simply an prefix that means one thousandth. I have seem picovolts, microvolts, millivolts, volts, kilovolts, megavolts and teravolts in common use. Other prefixes are also valid.
For a single-phase transformer, divide the ratedapparent power (expressed in volt amperes) by the voltage rating (expressed in volts) of the primary winding; this will give you the rated primary current (expressed in amperes) of the primary winding.
Any source of ionizing radiation makes ozone, and expressed voltages greater than 3 volts have the potential to make some ozone.
I=U/R so 30/2000=0.015 so 15 mA
There may be a crack in the ceramic. Also, all insulating materials have a dielectric breakdown voltage, often expressed in volts per mil (0.001 inch). For example barium titanate ceramic breaks down at 75 volts per mil. Thus a 0.5 inch thick insulator of barium titanate ceramic will withstand up to 37,500 volts.