# Ohms Law Power Calcs

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OHM’S LAW VARIATIONS OF OHM’S LAW VOLTS VOLTS = VOLTS = WATTSß ßOHMS œ ßßß x ßßß WATTS AMPERES E E W I2R R R E EI W I W/R WR E R E I W W E2 W T S I IR I2 OH 2 WA S TT AM P ES ER VOLTS = AMPERES x OHMS OHMS OHMS = OHMS = OHMS = VOLTS AMPERES VOLTS2 WATTS WATTS2 AMPERES2 M Table 11 Currents for resistance heating loads Single phase Three phase balanced load kW 120V 208V 240V 440V 480V 208V 240V 440V 480V 1 2 3 4 5 6 7.5 10 12 15 20 25 30 50 75 100 Applied Voltage VO 8.4 16.7 25 33.4 41.7
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Z-263 Percent of rated wattage for various applied voltages Applied Rated VoltageVoltage110115120208220230240277380415440460480550 VARIATIONS OF OHM’S LAWVOLTS œ ßßßßßßßß VOLTS =WATTS x OHMSVOLTS =WATTSAMPERESVOLTS = AMPERES x OHMS OHMS OHMS =VOLTSAMPERESOHMS =VOLTS 2 WATTSOHMS =WATTS 2 AMPERES 2 AMPERES AMPERES =VOLTSOHMSAMPERES =WATTSVOLTSAMPERES =WATTSOHMS WATTS WATTS =VOLTS 2 OHMSWATTS = AMPERES 2 x OHMSWATTS = VOLTS x AMPERES Currents for resistance heating loads Heating elements are frequently used atvoltages other than those shown in ourcatalog. The percentages shown beloware used to determine the resultingwattage. Should you wish to use aheater on a voltage not shown above,you may calculate the resultant wattagewith this formula: Actual Wattage = Rated Wattage xApplied Voltage2Rated Voltage2 Table 11 Currents for resistance heating loads 1 8.4 4.8 4.2 2.3 2.1 2.8 2.5 1.4 1.32 16.7 9.7 8.4 4.6 4.2 5.6 4.9 2.7 2.53 25 14.5 12.5 6.9 6.3 8.4 7.3 4 3.74 33.4 19.3 16.7 9.1 8.4 11.2 9.7 5.3 4.95 41.7 24.1 20.9 11.4 10.5 13.9 12.1 6.6 6.16 50 28.9 25 13.7 12.5 16.7 14.5 7.9 7.37.5 62.5 36.1 31.3 17.1 15.7 20.9 18.1 9.9 9.110 83.4 48.1 41.7 22.8 20.9 27.8 24.1 13.2 12.112 100 57.7 50 27.3 25 33.4 29 15.8 14.515 125 72.2 62.5 34.1 31.2 41.7 36.2 19.7 18.120 167 96.2 83.4 45.5 41.7 55.6 48.2 26.3 24.125 209 121 105 56.9 52.1 69.5 60.3 32.9 30.130 250 145 125 68.2 62.5 83.4 72.3 39.4 36.250 417 241 209 114 105 139 121 65.7 60.375 625 361 313 171 157 209 181 98.6 90.4100 834 481 417 228 209 278 241 132 121110 100% 91% 84% 28% 25% 23% 21% 16% 8.4% 7% 6.2% 5.7% 5.2% 4%115 109% 100% 92% 31% 27% 25% 23% 17% 9.0% 7.6% 6.7% 6.2% 5.7% 4.3%120 119% 109% 100% 33% 30% 27% 25% 19% 10% 8.4% 7.4% 6.8% 6.3% 4.8%208 300% 100% 89% 82% 75% 56% 30% 25% 22% 20% 19% 14%220 112% 100% 91% 84% 63% 34% 28% 25% 23% 21% 16%230 122% 109% 100% 92% 69% 37% 31% 27% 25% 23% 17%240 133% 119% 109% 100% 75% 40% 33% 30% 27% 25% 19%277 133% 100% 53% 45% 40% 36% 33% 25%380 188% 100% 84% 74% 68% 63% 47%415 119% 100% 89% 81% 75% 57%440 112% 100% 91% 84% 64%460 123% 109% 100% 92% 70%480 119% 109% 100% 76%550 156% 143% 131% 100% V     O    L   T     S     O    H    M    S    W    A     T    T   S A  M   P     E    R    E     S     WIRE EIIR W / RE 2 RI 2 RE 2 WEIERWI 2 WI  W E WR kW120V208V240V440V480V208V240V440V480VThree phase balanced loadSingle phase OHM’S LAW  One Omega Drive | Stamford, CT 06907 | 1-888-TC-OMEGA (1-888-826-6342) |   info@omega.c om   www.omega.com More than 100,000 Products Available!  CANADA www.omega.caLaval(Quebec)1-800-TC-OMEGA UNITED KINGDOM www. omega.co.ukManchester, England0800-488-488 GERMANY www.omega.deDeckenpfronn, Germany0800-8266342 FRANCE www.omega.frGuyancourt, France088-466-342 BENELUX www.omega.nlAmstelveen, NL0800-099-33-44 UNITED STATES www.omega.com1-800-TC-OMEGAStamford, CT. CZECH REPUBLIC www.omegaeng.czKarviná, Czech Republic596-311-899 Temperature Calibrators, Connectors, General Test and MeasurementInstruments, Glass Bulb Thermometers, Handheld Instrumentsfor Temperature Measurement, Ice Point References,Indicating Labels, Crayons, Cements and Lacquers, Infrared Temperature Measurement Instruments, Recorders RelativeHumidity Measurement Instruments, RTD Probes, Elementsand Assemblies, Temperature & Process Meters, Timers andCounters, Temperature and Process Controllers and PowerSwitching Devices, Thermistor Elements, Probes andAssemblies,Thermocouples Thermowells and Head and WellAssemblies, Transmitters, Wire Pressure, Strain and Force Displacement Transducers, Dynamic MeasurementForce Sensors, Instrumentation for Pressure and StrainMeasurements, Load Cells, Pressure Gauges, PressureReference Section, Pressure Switches, Pressure Transducers,Proximity Transducers, Regulators,Strain Gages, Torque Transducers, Valves pH and Conductivity Conductivity Instrumentation, Dissolved OxygenInstrumentation, Environmental Instrumentation, pHElectrodes and Instruments, Water and Soil AnalysisInstrumentation Heaters Band Heaters, Cartridge Heaters, Circulation Heaters,Comfort Heaters, Controllers, Meters and SwitchingDevices, Flexible Heaters, General Test and MeasurementInstruments, Heater Hook-up Wire, Heating CableSystems, Immersion Heaters, Process Air and Duct,Heaters, Radiant Heaters, Strip Heaters, Tubular Heaters Flow and Level Air Velocity Indicators, Doppler Flowmeters, LevelMeasurement, Magnetic Flowmeters, Mass Flowmeters,Pitot Tubes, Pumps, Rotameters, Turbine and Paddle WheelFlowmeters, Ultrasonic Flowmeters, Valves, Variable AreaFlowmeters, Vortex Shedding Flowmeters Data Acquisition Auto-Dialers and Alarm Monitoring Systems,Communication Products and Converters, DataAcquisition and Analysis Software, Data LoggersPlug-in Cards, Signal Conditioners, USB, RS232, RS485and Parallel Port Data Acquisition Systems, Wireless Transmitters and Receivers click here to go to the omega.com home page
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