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OHM'S LAW and What It Means to Homeowners

P=E*I or Watts =Volts * Amps

This is the most common variation of ohms law for residential electric. Often manufactures will only include two of the the three variables and the electrician or home owner will need to figure out the last quality. Often equipment only has a wattage on it. That is done with the expectation of the end user knows the voltage of their electrical system. In the United States residential lighting circuits usw 120 volts. So a 60watt light bulb divided by 120 volts uses .5amp. 60watt/120Volts=.5amps
Ohm's law electrical chart
  • Voltage = the Square Root of Power * Resistance
  • Voltage = Power / Current
  • Voltage = Current * Resistance
  • Resistance = Voltage / Current
  • Resistance = Power / Current squared
  • Resistance = Voltage squared / Power
  • Current = Voltage / Resistance
  • Current = the Square Root of Power / Resistance
  • Current = Power / Voltage
  • Power = Voltage * Current
  • Power = the Current squared * Resistance
  • Power = the Voltage squared / Resistance

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Generation 3 Electric has been servicing the electrical needs of the Philadelphia metro area for three generations. We were voted Philadelphia Magazine's 2012 Best Electrician. Our trained electricians understand any issues you have with the electric in your Philly home. Our technicians specialize in repairing, updating and servicing your homes electrical wiring and lighting for indoor and outdoor residential buildings. They are trained to always respect your home and be mindful of your time. Your 100% satisfaction is our goal. Generation 3 Electric is fully licensed and insured. You will never get a machine when calling our office; a friendly voice will always be there to assist you. Gen3 is also a Mitsubishi Electric Diamond Contractor in Philadelphia. To learn more, contact us today.
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