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Knowledgebase: General Electrical Terminology
Ohm's & Ohm's Law
Posted by Mark Mortimer on 18 January 2012 10:01 PM

Ohm (R or o or Ω) is the unit of electrical resistance. It is resistance to the flow of charges in a circuit, like friction that slows down a motor belt.

Ohm’s Law states the relationship between volts, amps,and ohms. It can be presented in three ways:

  • Amps = Volts ÷ Ohms
  • Ohms = Volts ÷ Amps
  • Volts = Amps x Ohms

Example: If a generating source has a voltage of 100 volts and the circuit’s resistance is 30 ohms, the amperage will be 3.3 amps.

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