标签: volts

电压功率对照表dbm-volts-wattsconversiondBm-volts-wattsconversion(50-ohmsystem)dBm+53+50+49+48+47+46+45+44+43+42+41+40+39+38+37+36+35+34+33+32+31+30+29+28+27+26+25+24+23+22+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1V100.070.764.058.050.044.540.032.532.028.026.222.520.018.016.014.112.511.510.09.08.07.106.405.805.004.454.003.553.202.802.522.252.001.801.601.411.251.151.00.90.80.71.64.58.500.445.400.355.320.280.252Po200W100W80W64W50W40W32W25W20W16W12.5W10W8W6.4W5W4W3.2W2.5W2W1.6W1.25W1.0W800mW640mW500mW400mW320mW250mW200mW160mW125mW100mW80mW64mW50mW40mW32mW25mW20mW16mW12.5mW10mW8mW6.4mW5mW4mW3.2mW2.5mW2.0mW1.6mW1.25mWdBm0-1-2-3……

HowManyVoltsISThisHowManyVoltsISThis?TheRMSRoleDouglasBrooksLet’sstarttheexplanationofwhywithadiscussionofpower.PowerisdefinedasVoltage*Current(orP=V*I).ByOhm’sLaw,V=I*R,orI=V/R.Therefore,bysubstitution,Power=V2/R.Soifweapplyavoltagesinewave(V*sin(Q))acrossaresistor,thepowerappliedtotheresistorisgivenbytheexpressionP=V2*sin2(Q)/R(showninFigure1(b)).ItcanbeshownthattheaveragepowerdeliveredtotheresistorisV2/2*R.Nowhereisthekeyquestion.WhatDC(directcurrent)voltagewilldelivertheSAMEpowertotheresistorastheACwaveformwehavejustbeenconsidering?Theansweris:EquivalentDCVolts=(V2/2).5=.707*V.THISisdefinedastheRMSvoltage.ItistheDCvoltagethatwoulddelivertheSAMEpowertoaresistiveload……