Appendix 2 UV — Under Voltage WARN — warning V ac, Vac, or VAC — volts alternating current WCP — weather radar control panel V dc, Vdc, or VDC — volts direct current WEA — weather V — volts; voltage; vertical; valve WEU — warning electronics unit power supply VA — volt-ampere WPT — waypoint VAR — volt-ampere reactive WX (WXR) — weather radar VFR — visual flight rules XCVR — transceiver VHF (vhf) — very high frequency (30 to 300 MHz) XDCR — transducer VLSI — very large-scale integration XFMR — transformer VOR — VHF omni-directional range XFR — transfer VORTAC — VOR Tactical Air Navigation XMIT — transmit VR — voltage regulator XMTR — transmitter VRMS — volts root means square XPDR — transponder W — watts
Appendix 3 APPENDIX 3. METRIC-BASED PREFIXES AND POWERS OF 10 Atto (a) = quintillionth of = 10-18 times Femto (f) = quadrillionth of = 10-15 times Pico (p), or (µµ) = trillionth of = 10-12 times Nano (n), or (mµ) = billionth of = 10-9 times Micro (µ) = millionth of = 10-6 times Milli (m) = thousandth of = 10-3 times Centi (c) = hundredth of = 10-2 times Deci (d) = tenth of = 10-1 times unity = 100 = 1 Deka (da) = ten times = 10 times Hecto (h) = hundred times = 102 times Kilo (k) = thousand times = 103 times Mega (M) = million times = 106 times Giga (G), or (kM) = billion times = 109 times Tera (T) = trillion times = 1012 times
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