question why dont u just use a voltmeter
AC - use a step-down transformer. DC - simplest but most wasteful, use a dropping resistor (in series). Otherwise it is costly.
Yes, 0 3 and 0 30 are equivalent.just add an imaginay 0 to 0 3.
It is Military slang. It is usually used to refer to any time when the sun isn't up, usually between mid-night and 4 am or so. Most operations start at Oh dark thirty, much earlier than a normal...
Yes, 30 degrees is an acute angle.