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Formulas
Essential engineering formulas for quick reference and revision
𝒇ₓ
Electrical Current Formulas in DC Circuit
I = V/R I = P/V I = √P/R
𝒇ₓ
Electrical Current Formulas in Single Phase AC Circuit
AC Circuit
𝒇ₓ
Electrical Potential or Voltage Formula in DC Circuits
DC Circuits
𝒇ₓ
Resistance:
Resistance is the opposition that a material offers to the flow of electric current. Its SI measuring unit is the “Ohm” and is denoted by the symbol (Ω). The relation formula of resistance:
